Post on 16-Jun-2015
description
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
9
0 26
+ 6 7
1
8
99
8
73
87
5
6 7 8
4
6
10
611 12
9
15
816 17 18
7
Exercise 1
13
919 20
14
Exercise 2
+ 6 7 8 9
73 4 5
62
8
99 10
86 7
611
6 7 8 9
12
15
18
713
816 17
14
919 20
12
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
209
18 19
816 17
7
611 12
1514
6
13
9
10
2
6 7 8
9
78
74 5
98
Exercise 3
6
+ 6 7 8 9
1 3
Exercise 4
+ 6 7 8 9
3
74 5
62
98 9 10
86 7
611 12
6 7 8 9
13
7
816 17
14 15
209
18 19
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
919 20
816 17 18
713
611 12
1514
87
5
9
1
6 7 8
6
10
8
73 4
99
2
Exercise 5
6
+ 6 7 8 9
61 2
Exercise 6
+ 6 7 8 9
86
3
74 5
6 7 8
7
98 9 10
9
611 12 13
15
816 17
714
209
18 19
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
7
919 20
816 17 18
13 14
9
12
15
6 7 8
611
8
99 10
86 7
73 4 5
62
Exercise 8
+ 6 7 8 9
209
19
816 17 18
713 14
611 12
15
87
5
9
1
6 7 8
4
68
73
99 10
Exercise 7
6
+ 6 7 8 9
2
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
7
209
19
816 17 18
13 14
9
15
6 7 8
611 12
8
99 10
86 7
2
73 4 5
61
Exercise 10
+ 6 7 8 9
919 20
816 17 18
713
611
1514
7
5
12
9
10
2
6 7 8
6 88
73 4
99
Exercise 9
6
+ 6 7 8 9
1
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
209
19
816 17 18
9
15
611 12
13 147
6 7
6 7 8
1
8
99 10
8
9
2
73 4 5
6
9
2
Exercise 12
+ 6 7 8
6
+ 6 7
1
8
99
8
73
87
5
6 7 8
4
6
10
611 12
9
15
816 17 18
7
Exercise 11
13
209
19
14
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 6 + 6 = 11. 15 - 8 = 1. 6 + 7 = 11. 15 - 6 =
2. 7 + 9 = 12. 13 - 6 = 2. 8 + 8 = 12. 17 - 9 =
3. 7 + 7 = 13. 15 - 9 = 3. 7 + 6 = 13. 14 - 8 =
4. 9 + 8 = 14. 13 - 7 = 4. 6 + 9 = 14. 13 - 7 =
5. 6 + 9 = 15. 14 - 6 = 5. 7 + 8 = 15. 14 - 6 =
6. 8 + 8 = 16. 16 - 7 = 6. 9 + 7 = 16. 15 - 7 =
7. 6 + 8 = 17. 15 - 6 = 7. 8 + 6 = 17. 17 - 8 =
8. 9 + 6 = 18. 16 - 8 = 8. 9 + 9 = 18. 14 - 7 =
9. 8 + 7 = 19. 14 - 7 = 9. 9 + 8 = 19. 16 - 9 =
10. 8 + 9 = 20. 18 - 9 = 10. 7 + 9 = 20. 12 - 6 =
Exercise 13 Exercise 14
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 8 + 7 = 11. 14 - 6 = 1. 8 + 8 = 11. 14 - 8 =
2. 6 + 8 = 12. 15 - 9 = 2. 9 + 9 = 12. 12 - 6 =
3. 7 + 9 = 13. 14 - 7 = 3. 8 + 6 = 13. 16 - 9 =
4. 8 + 9 = 14. 18 - 9 = 4. 9 + 7 = 14. 15 - 7 =
5. 9 + 6 = 15. 13 - 6 = 5. 7 + 8 = 15. 17 - 8 =
6. 9 + 8 = 16. 16 - 7 = 6. 9 + 8 = 16. 14 - 7 =
7. 7 + 7 = 17. 15 - 8 = 7. 7 + 6 = 17. 15 - 6 =
8. 6 + 6 = 18. 15 - 6 = 8. 6 + 9 = 18. 14 - 6 =
9. 8 + 8 = 19. 16 - 8 = 9. 6 + 7 = 19. 17 - 9 =
10. 6 + 9 = 20. 13 - 7 = 10. 7 + 9 = 20. 13 - 7 =
Exercise 15 Exercise 16
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 8 + 7 = 11. 6 + 8 = 1. 8 + 8 = 11. 9 + 8 =
2. 16 - 7 = 12. 15 - 9 = 2. 17 - 8 = 12. 12 - 6 =
3. 6 + 9 = 13. 6 + 6 = 3. 8 + 6 = 13. 7 + 9 =
4. 15 - 8 = 14. 18 - 9 = 4. 14 - 8 = 14. 15 - 7 =
5. 9 + 6 = 15. 8 + 9 = 5. 7 + 8 = 15. 9 + 7 =
6. 14 - 6 = 16. 15 - 6 = 6. 17 - 9 = 16. 14 - 7 =
7. 7 + 7 = 17. 9 + 8 = 7. 7 + 6 = 17. 6 + 9 =
8. 14 - 7 = 18. 16 - 8 = 8. 16 - 9 = 18. 14 - 6 =
9. 8 + 8 = 19. 7 + 9 = 9. 6 + 7 = 19. 9 + 9 =
10. 13 - 6 = 20. 13 - 7 = 10. 15 - 6 = 20. 13 - 7 =
Exercise 17 Exercise 18
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 6 9 = 11. 42 7 = 1. 7 6 = 11. 36 6 =
2. 9 6 = 12. 48 6 = 2. 7 9 = 12. 56 7 =
3. 7 7 = 13. 56 8 = 3. 6 7 = 13. 72 9 =
4. 8 8 = 14. 49 7 = 4. 9 8 = 14. 48 8 =
5. 7 9 = 15. 54 9 = 5. 6 9 = 15. 63 9 =
6. 9 8 = 16. 81 9 = 6. 8 8 = 16. 54 6 =
7. 6 6 = 17. 42 6 = 7. 9 7 = 17. 49 7 =
8. 8 9 = 18. 63 7 = 8. 8 6 = 18. 72 8 =
9. 6 8 = 19. 54 6 = 9. 7 8 = 19. 48 6 =
10. 8 7 = 20. 64 8 = 10. 9 9 = 20. 42 7 =
Exercise 19 Exercise 20
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 7 9 = 11. 54 6 = 1. 8 8 = 11. 54 6 =
2. 9 8 = 12. 64 8 = 2. 6 9 = 12. 49 7 =
3. 6 6 = 13. 54 9 = 3. 8 6 = 13. 48 8 =
4. 8 9 = 14. 81 9 = 4. 7 8 = 14. 72 9 =
5. 6 8 = 15. 42 7 = 5. 9 9 = 15. 42 7 =
6. 6 9 = 16. 63 7 = 6. 7 6 = 16. 36 6 =
7. 8 7 = 17. 48 6 = 7. 7 9 = 17. 56 7 =
8. 9 6 = 18. 42 6 = 8. 6 7 = 18. 48 6 =
9. 7 7 = 19. 56 8 = 9. 9 8 = 19. 72 8 =
10. 8 8 = 20. 49 7 = 10. 9 7 = 20. 63 9 =
Exercise 21 Exercise 22
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 7 7 = 11. 9 6 = 1. 9 7 = 11. 8 6 =
2. 54 6 = 12. 64 8 = 2. 48 8 = 12. 54 6 =
3. 6 6 = 13. 8 8 = 3. 7 6 = 13. 8 8 =
4. 56 8 = 14. 81 9 = 4. 48 6 = 14. 72 8 =
5. 6 8 = 15. 9 8 = 5. 6 7 = 15. 9 8 =
6. 54 9 = 16. 63 7 = 6. 72 9 = 16. 49 7 =
7. 8 7 = 17. 7 9 = 7. 6 9 = 17. 7 9 =
8. 42 7 = 18. 42 6 = 8. 56 7 = 18. 42 7 =
9. 8 9 = 19. 6 9 = 9. 9 9 = 19. 7 8 =
10. 48 6 = 20. 49 7 = 10. 63 9 = 20. 36 6 =
Exercise 23 Exercise 24
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 9 + 7 = 11. 8 9 = 1. 8 + 8 = 11. 9 6 =
2. 7 + 6 = 12. 6 7 = 2. 7 + 7 = 12. 7 7 =
3. 8 + 9 = 13. 8 6 = 3. 9 + 6 = 13. 6 8 =
4. 6 + 8 = 14. 9 8 = 4. 6 + 9 = 14. 7 9 =
5. 8 + 7 = 15. 7 6 = 5. 9 + 8 = 15. 8 7 =
6. 15 - 7 = 16. 56 8 = 6. 16 - 9 = 16. 64 8 =
7. 18 - 9 = 17. 36 6 = 7. 14 - 6 = 17. 54 6 =
8. 12 - 6 = 18. 63 7 = 8. 17 - 8 = 18. 49 7 =
9. 15 - 8 = 19. 81 9 = 9. 13 - 7 = 19. 54 9 =
10. 16 - 8 = 20. 48 6 = 10. 14 - 8 = 20. 63 7 =
Exercise 25 Exercise 26
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 7 + 8 = 11. 7 6 = 1. 9 + 8 = 11. 7 8 =
2. 6 + 6 = 12. 6 9 = 2. 6 + 7 = 12. 6 6 =
3. 9 + 9 = 13. 8 8 = 3. 8 + 6 = 13. 8 7 =
4. 8 + 7 = 14. 9 7 = 4. 7 + 9 = 14. 9 9 =
5. 9 + 8 = 15. 7 8 = 5. 8 + 7 = 15. 6 8 =
6. 14 - 7 = 16. 63 9 = 6. 16 - 7 = 16. 42 6 =
7. 15 - 9 = 17. 42 7 = 7. 17 - 9 = 17. 72 9 =
8. 16 - 8 = 18. 48 6 = 8. 14 - 8 = 18. 63 7 =
9. 15 - 6 = 19. 72 8 = 9. 13 - 6 = 19. 48 8 =
10. 17 - 9 = 20. 64 8 = 10. 15 - 6 = 20. 56 7 =
Exercise 27 Exercise 28
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 6 + 6 = 11. 8 8 = 1. 6 + 7 = 11. 7 8 =
2. 9 + 7 = 12. 8 6 = 2. 9 + 6 = 12. 9 6 =
3. 6 + 8 = 13. 9 9 = 3. 8 + 7 = 13. 8 9 =
4. 9 + 9 = 14. 7 7 = 4. 7 + 9 = 14. 6 7 =
5. 6 + 9 = 15. 8 9 = 5. 8 + 6 = 15. 7 9 =
6. 16 - 9 = 16. 72 9 = 6. 12 - 6 = 16. 36 6 =
7. 13 - 6 = 17. 42 7 = 7. 15 - 9 = 17. 81 9 =
8. 14 - 8 = 18. 56 8 = 8. 17 - 8 = 18. 63 7 =
9. 13 - 7 = 19. 54 6 = 9. 16 - 7 = 19. 72 8 =
10. 17 - 8 = 20. 49 7 = 10. 15 - 8 = 20. 64 8 =
Exercise 29 Exercise 30
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 7 + 6 = 11. 8 7 = 1. 6 + 9 = 11. 9 7 =
2. 9 + 8 = 12. 6 8 = 2. 8 + 8 = 12. 6 6 =
3. 8 + 6 = 13. 6 9 = 3. 7 + 7 = 13. 7 9 =
4. 7 + 8 = 14. 7 6 = 4. 8 + 9 = 14. 9 8 =
5. 6 + 9 = 15. 9 7 = 5. 6 + 7 = 15. 6 9 =
6. 16 - 8 = 16. 63 9 = 6. 15 - 6 = 16. 48 6 =
7. 15 - 7 = 17. 42 6 = 7. 18 - 9 = 17. 56 7 =
8. 17 - 9 = 18. 48 8 = 8. 15 - 8 = 18. 64 8 =
9. 14 - 6 = 19. 49 7 = 9. 14 - 7 = 19. 54 9 =
10. 18 - 9 = 20. 54 9 = 10. 17 - 8 = 20. 63 7 =
Exercise 31 Exercise 32
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 8 + 9 = 11. 12 - 6 = 1. 9 + 6 = 11. 16 - 9 =
2. 6 + 8 = 12. 15 - 8 = 2. 6 + 9 = 12. 14 - 6 =
3. 15 - 7 = 13. 8 9 = 3. 17 - 8 = 13. 9 6 =
4. 18 - 9 = 14. 6 7 = 4. 13 - 7 = 14. 7 7 =
5. 8 6 = 15. 56 7 = 5. 6 8 = 15. 49 7 =
6. 9 8 = 16. 36 6 = 6. 7 9 = 16. 54 9 =
7. 56 8 = 17. 9 + 6 = 7. 64 8 = 17. 9 + 7 =
8. 81 9 = 18. 17 - 8 = 8. 54 6 = 18. 15 - 9 =
9. 9 + 7 = 19. 6 6 = 9. 8 + 8 = 19. 8 6 =
10. 7 + 6 = 20. 72 9 = 10. 7 + 7 = 20. 63 7 =
Exercise 33 Exercise 34
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 9 + 9 = 11. 14 - 7 = 1. 9 + 8 = 11. 16 - 7 =
2. 8 + 7 = 12. 15 - 9 = 2. 6 + 7 = 12. 17 - 9 =
3. 15 - 6 = 13. 8 8 = 3. 14 - 8 = 13. 7 8 =
4. 16 - 8 = 14. 9 7 = 4. 13 - 6 = 14. 6 6 =
5. 7 6 = 15. 63 9 = 5. 8 7 = 15. 63 7 =
6. 6 9 = 16. 42 7 = 6. 9 9 = 16. 48 8 =
7. 48 6 = 17. 9 + 8 = 7. 42 6 = 17. 8 + 7 =
8. 72 8 = 18. 17 - 9 = 8. 72 9 = 18. 15 - 6 =
9. 7 + 8 = 19. 7 8 = 9. 8 + 6 = 19. 6 8 =
10. 6 + 6 = 20. 64 8 = 10. 7 + 9 = 20. 56 7 =
Exercise 35 Exercise 36
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 6 + 8 = 11. 8 8 = 1. 8 + 6 = 11. 9 6 =
2. 13 - 6 = 12. 42 7 = 2. 16 - 7 = 12. 81 9 =
3. 8 6 = 13. 6 + 6 = 3. 8 9 = 13. 9 + 6 =
4. 72 9 = 14. 13 - 7 = 4. 63 7 = 14. 12 - 6 =
5. 9 + 7 = 15. 7 7 = 5. 6 + 7 = 15. 7 8 =
6. 14 - 8 = 16. 54 6 = 6. 15 - 9 = 16. 72 8 =
7. 9 9 = 17. 6 + 9 = 7. 6 7 = 17. 7 + 9 =
8. 56 8 = 18. 17 - 8 = 8. 36 6 = 18. 15 - 8 =
9. 9 + 9 = 19. 8 9 = 9. 8 + 7 = 19. 7 9 =
10. 16 - 9 = 20. 49 7 = 10. 17 - 8 = 20. 64 8 =
Exercise 37 Exercise 38
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 7 + 8 = 11. 7 6 = 1. 8 + 9 = 11. 7 9 =
2. 16 - 8 = 12. 42 6 = 2. 15 - 8 = 12. 48 6 =
3. 6 8 = 13. 8 + 6 = 3. 6 6 = 13. 6 + 9 =
4. 48 8 = 14. 15 - 7 = 4. 64 8 = 14. 15 - 6 =
5. 9 + 8 = 15. 6 9 = 5. 7 + 7 = 15. 9 8 =
6. 17 - 9 = 16. 63 9 = 6. 18 - 9 = 16. 54 9 =
7. 8 7 = 17. 6 + 9 = 7. 9 7 = 17. 6 + 7 =
8. 49 7 = 18. 18 - 7 = 8. 56 7 = 18. 17 - 8 =
9. 7 + 6 = 19. 9 7 = 9. 8 + 8 = 19. 6 9 =
10. 14 - 6 = 20. 54 8 = 10. 14 - 7 = 20. 63 7 =
Exercise 39 Exercise 40
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 56 8 = 11. 6 + 8 = 1. 15 - 8 = 11. 12 - 6 =
2. 9 + 9 = 12. 13 - 6 = 2. 7 9 = 12. 7 8 =
3. 16 - 9 = 13. 8 6 = 3. 64 8 = 13. 72 8 =
4. 8 9 = 14. 9 + 7 = 4. 15 - 9 = 14. 7 + 9 =
5. 6 + 9 = 15. 14 - 8 = 5. 6 7 = 15. 9 6 =
6. 49 7 = 16. 9 9 = 6. 36 6 = 16. 16 - 7 =
7. 8 8 = 17. 17 - 8 = 7. 8 + 7 = 17. 8 9 =
8. 42 7 = 18. 72 9 = 8. 17 - 8 = 18. 8 + 6 =
9. 6 + 6 = 19. 7 7 = 9. 63 7 = 19. 81 9 =
10. 13 - 7 = 20. 54 6 = 10. 6 + 7 = 20. 9 + 6 =
Exercise 41 Exercise 42
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 6 9 = 11. 8 7 = 1. 18 - 9 = 11. 8 + 9 =
2. 63 9 = 12. 9 + 8 = 2. 9 7 = 12. 15 - 8 =
3. 7 + 6 = 13. 17 - 9 = 3. 56 7 = 13. 6 6 =
4. 49 7 = 14. 48 8 = 4. 8 + 8 = 14. 17 - 8 =
5. 7 + 8 = 15. 9 7 = 5. 14 - 7 = 15. 6 9 =
6. 16 - 8 = 16. 14 - 6 = 6. 9 8 = 16. 63 7 =
7. 6 8 = 17. 6 + 9 = 7. 54 9 = 17. 7 9 =
8. 42 6 = 18. 18 - 9 = 8. 6 + 7 = 18. 48 6 =
9. 8 + 6 = 19. 54 9 = 9. 64 8 = 19. 6 + 9 =
10. 15 - 7 = 20. 7 6 = 10. 7 + 7 = 20. 15 - 6 =
Exercise 43 Exercise 44
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 7 7 = 11. 42 7 = 1. 9 6 = 11. 8 + 7 =
2. 54 6 = 12. 6 + 6 = 2. 81 9 = 12. 17 - 8 =
3. 8 6 = 13. 13 - 7 = 3. 9 + 6 = 13. 63 7 =
4. 9 + 7 = 14. 56 8 = 4. 15 - 9 = 14. 7 9 =
5. 14 - 8 = 15. 9 + 9 = 5. 6 7 = 15. 8 + 6 =
6. 49 7 = 16. 17 - 8 = 6. 36 6 = 16. 16 - 7 =
7. 8 9 = 17. 6 + 8 = 7. 12 - 6 = 17. 8 9 =
8. 6 + 9 = 18. 9 9 = 8. 7 8 = 18. 15 - 8 =
9. 16 - 9 = 19. 13 - 6 = 9. 72 8 = 19. 6 + 7 =
10. 8 8 = 20. 72 9 = 10. 7 + 9 = 20. 64 8 =
Exercise 45 Exercise 46
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 9 + 8 = 11. 6 9 = 1. 7 9 = 11. 9 8 =
2. 42 6 = 12. 63 9 = 2. 48 6 = 12. 6 + 7 =
3. 15 - 7 = 13. 14 - 6 = 3. 6 + 9 = 13. 63 7 =
4. 7 6 = 14. 7 + 6 = 4. 56 7 = 14. 8 + 9 =
5. 7 + 8 = 15. 18 - 9 = 5. 14 - 7 = 15. 15 - 8 =
6. 16 - 8 = 16. 54 9 = 6. 7 + 7 = 16. 6 6 =
7. 8 + 6 = 17. 6 + 9 = 7. 9 7 = 17. 17 - 8 =
8. 49 7 = 18. 9 7 = 8. 8 + 8 = 18. 54 9 =
9. 17 - 9 = 19. 48 8 = 9. 64 8 = 19. 6 9 =
10. 6 8 = 20. 8 7 = 10. 18 - 9 = 20. 15 - 6 =
Exercise 47 Exercise 48
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 9 + 6 = 11. 7 8 = 1. 6 + 6 = 11. 56 8 =
2. 6 8 = 12. 16 - 7 = 2. 15 - 7 = 12. 7 + 9 =
3. 14 - 7 = 13. 8 9 = 3. 9 9 = 13. 63 9 =
4. 42 6 = 14. 15 - 6 = 4. 48 6 = 14. 8 6 =
5. 9 7 = 15. 48 8 = 5. 9 + 8 = 15. 16 - 9 =
6. 16 - 8 = 16. 7 + 7 = 6. 6 7 = 16. 8 + 7 =
7. 72 9 = 17. 15 - 9 = 7. 81 9 = 17. 7 8 =
8. 8 + 6 = 18. 8 + 8 = 8. 16 - 7 = 18. 12 - 6 =
9. 81 9 = 19. 63 7 = 9. 9 8 = 19. 42 7 =
10. 6 + 9 = 20. 7 6 = 10. 17 - 8 = 20. 9 + 6 =
Exercise 49 Exercise 50
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 7 + 6 = 11. 64 8 = 1. 8 + 6 = 11. 36 6 =
2. 8 8 = 12. 13 - 6 = 2. 7 9 = 12. 9 7 =
3. 14 - 8 = 13. 72 9 = 3. 13 - 7 = 13. 7 + 8 =
4. 49 7 = 14. 7 7 = 4. 56 7 = 14. 7 8 =
5. 9 6 = 15. 6 + 8 = 5. 6 6 = 15. 63 9 =
6. 16 - 7 = 16. 9 + 7 = 6. 15 - 8 = 16. 18 - 9 =
7. 54 9 = 17. 17 - 9 = 7. 72 8 = 17. 6 + 7 =
8. 14 - 7 = 18. 6 9 = 8. 7 + 6 = 18. 9 8 =
9. 7 8 = 19. 54 6 = 9. 54 9 = 19. 14 - 6 =
10. 8 + 9 = 20. 8 + 6 = 10. 9 + 9 = 20. 8 7 =
Exercise 51 Exercise 52
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 72 9 = 11. 7 8 = 1. 8 + 7 = 11. 9 9 =
2. 8 + 6 = 12. 16 - 7 = 2. 7 8 = 12. 15 - 7 =
3. 81 9 = 13. 63 7 = 3. 12 - 6 = 13. 81 9 =
4. 6 + 9 = 14. 7 + 7 = 4. 42 7 = 14. 16 - 7 =
5. 9 + 6 = 15. 8 + 8 = 5. 9 + 6 = 15. 9 8 =
6. 6 8 = 16. 15 - 6 = 6. 56 8 = 16. 17 - 8 =
7. 14 - 7 = 17. 7 6 = 7. 7 + 9 = 17. 6 + 6 =
8. 42 6 = 18. 15 - 9 = 8. 63 9 = 18. 6 7 =
9. 9 7 = 19. 48 8 = 9. 8 6 = 19. 9 + 8 =
10. 16 - 8 = 20. 8 9 = 10. 16 - 9 = 20. 48 6 =
Exercise 53 Exercise 54
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 72 9 = 11. 14 - 7 = 1. 72 8 = 11. 14 - 6 =
2. 17 - 9 = 12. 7 8 = 2. 9 + 9 = 12. 8 7 =
3. 6 + 8 = 13. 8 + 9 = 3. 54 9 = 13. 7 + 6 =
4. 64 8 = 14. 54 9 = 4. 15 - 8 = 14. 18 - 9 =
5. 13 - 6 = 15. 14 - 8 = 5. 6 + 7 = 15. 56 7 =
6. 7 7 = 16. 6 9 = 6. 9 8 = 16. 6 6 =
7. 49 7 = 17. 7 + 6 = 7. 36 6 = 17. 63 9 =
8. 9 6 = 18. 8 8 = 8. 7 8 = 18. 8 + 6 =
9. 16 - 7 = 19. 54 6 = 9. 7 + 8 = 19. 7 9 =
10. 9 + 7 = 20. 8 + 6 = 10. 9 7 = 20. 13 - 7 =
Exercise 55 Exercise 56
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 15 - 6 = 11. 9 7 = 1. 9 8 = 11. 42 7 =
2. 7 6 = 12. 16 - 8 = 2. 17 - 8 = 12. 9 + 6 =
3. 16 - 7 = 13. 9 + 6 = 3. 9 9 = 13. 56 8 =
4. 6 8 = 14. 8 9 = 4. 15 - 7 = 14. 7 + 9 =
5. 14 - 7 = 15. 72 9 = 5. 9 + 8 = 15. 16 - 9 =
6. 42 6 = 16. 8 + 6 = 6. 48 6 = 16. 8 6 =
7. 8 + 8 = 17. 7 = 56 7. 6 + 6 = 17. 63 = 7
8. 63 7 = 18. 15 - = 6 8. 6 7 = 18. 8 + = 15
9. 7 + 7 = 19. 81 = 9 9. 81 9 = 19. 7 = 56
10. 48 8 = 20. 6 + = 15 10. 16 - 7 = 20. 12 - = 6
Exercise 57 Exercise 58
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 64 8 = 11. 72 9 = 1. 9 8 = 11. 8 + 6 =
2. 13 - 6 = 12. 17 - 9 = 2. 18 - 9 = 12. 7 9 =
3. 9 + 7 = 13. 6 + 8 = 3. 56 7 = 13. 13 - 7 =
4. 49 7 = 14. 14 - 7 = 4. 6 6 = 14. 36 6 =
5. 7 7 = 15. 8 8 = 5. 72 8 = 15. 14 - 6 =
6. 14 - 8 = 16. 54 6 = 6. 7 + 6 = 16. 8 7 =
7. 7 + 6 = 17. 8 + = 14 7. 54 9 = 17. 15 - = 7
8. 7 8 = 18. 9 = 54 8. 9 + 9 = 18. 6 + = 13
9. 8 + 9 = 19. 16 - = 9 9. 9 7 = 19. 7 = 56
10. 6 9 = 20. 54 = 6 10. 7 + 8 = 20. 63 = 7
Exercise 59 Exercise 60
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 7 8 = 11. 14 - 7 = 1. 8 + 7 = 11. 6 7 =
2. 8 + 8 = 12. 42 6 = 2. 42 7 = 12. 81 9 =
3. 81 9 = 13. 16 - 7 = 3. 12 - 6 = 13. 16 - 7 =
4. 6 + 9 = 14. 7 6 = 4. 7 + 9 = 14. 9 8 =
5. 63 7 = 15. 16 - 8 = 5. 16 - 9 = 15. 17 - 8 =
6. 7 + 7 = 16. 6 8 = 6. 8 6 = 16. 6 + 6 =
7. 15 - 9 = 17. 15 - = 9 7. 63 9 = 17. 15 - = 8
8. 8 9 = 18. 9 = 63 8. 7 8 = 18. 9 + = 17
9. 72 9 = 19. 48 = 6 9. 9 + 6 = 19. 48 = 8
10. 8 + 6 = 20. 9 + = 15 10. 56 8 = 20. 9 = 81
Exercise 61 Exercise 62
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 8 + 6 = 11. 7 7 = 1. 13 - 7 = 11. 9 7 =
2. 9 6 = 12. 13 - 6 = 2. 36 6 = 12. 7 + 8 =
3. 9 + 7 = 13. 7 + 6 = 3. 14 - 6 = 13. 7 8 =
4. 7 8 = 14. 54 9 = 4. 8 7 = 14. 63 9 =
5. 8 + 9 = 15. 72 9 = 5. 7 + 6 = 15. 8 + 6 =
6. 16 - 7 = 16. 17 - 9 = 6. 54 9 = 16. 7 9 =
7. 64 8 = 17. 6 + = 14 7. 15 - 8 = 17. 9 + = 18
8. 6 9 = 18. 14 - = 7 8. 6 + 7 = 18. 56 = 8
9. 14 - 8 = 19. 8 = 64 9. 6 6 = 19. 9 = 72
10. 49 7 = 20. 54 = 9 10. 72 8 = 20. 18 - = 9
Exercise 63 Exercise 64
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 36 6 = 11. 8 6 = 1. 9 7 = 11. 12 - 6 =
2. 15 - 9 = 12. 15 - 7 = 2. 63 9 = 12. 7 + 8 =
3. 7 + 7 = 13. 7 8 = 3. 14 - 7 = 13. 13 - 6 =
4. 42 7 = 14. 54 6 = 4. 6 9 = 14. 7 6 =
5. 6 8 = 15. 6 + 6 = 5. 48 8 = 15. 63 7 =
6. 72 9 = 16. 17 - 8 = 6. 8 + 9 = 16. 9 8 =
7. 8 + 9 = 17. 13 - = 7 7. 15 - 8 = 17. 9 + = 15
8. 7 9 = 18. 9 + = 18 8. 6 + 7 = 18. 18 - = 9
9. 14 - 7 = 19. 56 = 7 9. 54 9 = 19. 8 = 56
10. 8 + 8 = 20. 9 = 63 10. 16 - 8 = 20. 48 = 8
Exercise 65 Exercise 66
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 81 9 = 11. 6 + 6 = 1. 9 8 = 11. 14 - 6 =
2. 7 + 9 = 12. 15 - 8 = 2. 16 - 9 = 12. 81 9 =
3. 7 7 = 13. 54 9 = 3. 49 7 = 13. 6 + 9 =
4. 13 - 7 = 14. 6 6 = 4. 6 7 = 14. 9 6 =
5. 6 + 8 = 15. 8 + 6 = 5. 14 - 8 = 15. 16 - 7 =
6. 17 - 9 = 16. 72 8 = 6. 8 9 = 16. 9 + 8 =
7. 42 6 = 17. 9 + = 16 7. 13 - 7 = 17. 7 + = 13
8. 6 8 = 18. 9 = 81 8. 48 6 = 18. 17 - = 8
9. 16 - 7 = 19. 56 = 8 9. 8 + 7 = 19. 7 = 56
10. 8 8 = 20. 15 - = 9 10. 64 8 = 20. 36 = 6
Exercise 67 Exercise 68
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 8 6 = 11. 7 9 = 1. 8 + 9 = 11. 9 8 =
2. 56 8 = 12. 13 - 6 = 2. 15 - 8 = 12. 14 - 7 =
3. 15 - 9 = 13. 9 + 9 = 3. 6 + 7 = 13. 48 6 =
4. 54 6 = 14. 15 - 7 = 4. 54 9 = 14. 8 7 =
5. 9 7 = 15. 6 + 6 = 5. 16 - 8 = 15. 9 + 6 =
6. 72 9 = 16. 36 6 = 6. 9 7 = 16. 18 - 9 =
7. 8 + 9 = 17. 17 - = 9 7. 63 9 = 17. 7 + = 15
8. 7 8 = 18. 7 + = 14 8. 7 6 = 18. 6 = 54
9. 14 - 7 = 19. 42 = 6 9. 13 - 6 = 19. 12 - = 6
10. 8 + 8 = 20. 6 = 48 10. 48 8 = 20. 63 = 9
Exercise 69 Exercise 70
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 6 + 8 = 11. 17 - 9 = 1. 14 - 8 = 11. 8 9 =
2. 42 6 = 12. 6 + 6 = 2. 7 + 6 = 12. 13 - 7 =
3. 9 9 = 13. 6 8 = 3. 81 9 = 13. 48 6 =
4. 56 7 = 14. 16 - 7 = 4. 8 + 7 = 14. 17 - 9 =
5. 6 6 = 15. 8 8 = 5. 36 6 = 15. 64 8 =
6. 8 + 6 = 16. 81 9 = 6. 14 - 6 = 16. 9 8 =
7. 15 - 8 = 17. 7 + = 16 7. 7 8 = 17. 16 - = 7
8. 54 9 = 18. 7 = 49 8. 6 + 9 = 18. 49 = 7
9. 15 - 6 = 19. 13 - = 6 9. 9 6 = 19. 6 = 42
10. 9 + 7 = 20. 72 = 9 10. 16 - 7 = 20. 9 + = 17
Exercise 71 Exercise 72
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 14 - 7 = 11. 6 8 = 1. 8 7 = 11. 48 8 =
2. 8 + 8 = 12. 9 + 9 = 2. 12 - 6 = 12. 7 6 =
3. 54 6 = 13. 15 - 7 = 3. 63 9 = 13. 15 - 8 =
4. 9 7 = 14. 6 + 6 = 4. 14 - 7 = 14. 9 + 6 =
5. 72 9 = 15. 36 6 = 5. 6 + 7 = 15. 63 7 =
6. 8 6 = 16. 17 - 8 = 6. 13 - 6 = 16. 9 8 =
7. 56 8 = 17. 8 + = 17 7. 7 + 8 = 17. 8 + = 17
8. 15 - 9 = 18. 8 = 56 8. 48 6 = 18. 54 = 6
9. 7 9 = 19. 13 - = 7 9. 18 - 9 = 19. 16 - = 8
10. 7 + 7 = 20. 42 = 6 10. 6 9 = 20. 9 = 63
Exercise 73 Exercise 74
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 8 8 = 11. 56 7 = 1. 17 - 9 = 11. 6 + 9 =
2. 81 9 = 12. 6 6 = 2. 64 8 = 12. 9 6 =
3. 7 + 9 = 13. 72 8 = 3. 7 + 6 = 13. 16 - 7 =
4. 15 - 6 = 14. 17 - 9 = 4. 36 6 = 14. 8 9 =
5. 9 + 7 = 15. 9 9 = 5. 14 - 6 = 15. 49 7 =
6. 13 - 7 = 16. 8 + 6 = 6. 7 8 = 16. 16 - 9 =
7. 42 6 = 17. 6 + = 14 7. 9 + 8 = 17. 8 + = 15
8. 16 - 7 = 18. 7 = 49 8. 9 8 = 18. 13 - = 6
9. 6 + 6 = 19. 15 - = 7 9. 81 9 = 19. 48 = 8
10. 6 8 = 20. 54 = 6 10. 14 - 8 = 20. 6 = 42
Exercise 75 Exercise 76
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 7 + 7 = 11. 72 9 = 1. 13 - 6 = 11. 14 - 7 =
2. 13 - 6 = 12. 8 6 = 2. 54 9 = 12. 6 + 7 =
3. 42 7 = 13. 9 + 9 = 3. 8 + 9 = 13. 63 7 =
4. 8 + 8 = 14. 14 - 7 = 4. 8 7 = 14. 9 8 =
5. 7 9 = 15. 36 6 = 5. 9 + 6 = 15. 48 8 =
6. 15 - 9 = 16. 17 - 8 = 6. 63 9 = 16. 15 - 8 =
7. 6 + 6 = 17. 6 = 48 7. 16 - 8 = 17. 7 + = 15
8. 7 8 = 18. 15 - = 8 8. 9 7 = 18. 7 = 42
9. 54 6 = 19. 56 = 7 9. 12 - 6 = 19. 48 = 8
10. 9 7 = 20. 8 + = 17 10. 6 9 = 20. 18 - = 9
Exercise 77 Exercise 78
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 6 + 6 = 11. 13 - 7 = 1. 9 6 = 11. 9 8 =
2. 6 8 = 12. 6 + 8 = 2. 16 - 7 = 12. 36 6 =
3. 42 6 = 13. 56 7 = 3. 8 9 = 13. 6 + 9 =
4. 17 - 9 = 14. 6 6 = 4. 49 7 = 14. 17 - 9 =
5. 8 8 = 15. 16 - 7 = 5. 7 8 = 15. 64 8 =
6. 81 9 = 16. 8 + 6 = 6. 9 + 8 = 16. 14 - 6 =
7. 7 + 9 = 17. 9 = 81 7. 14 - 8 = 17. 81 = 9
8. 7 7 = 18. 15 - = 9 8. 7 + 6 = 18. 6 = 42
9. 15 - 8 = 19. 9 + = 16 9. 13 - 7 = 19. 8 + = 15
10. 54 9 = 20. 72 = 9 10. 48 6 = 20. 15 - = 6
Exercise 79 Exercise 80
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 64 8 = 11. 42 6 = 1. 6 + 6 = 11. 36 6 =
2. 14 - 8 = 12. 9 8 = 2. 7 7 = 12. 7 + 9 =
3. 8 + 7 = 13. 72 9 = 3. 63 9 = 13. 13 - 7 =
4. 14 - 7 = 14. 18 - 9 = 4. 8 6 = 14. 9 9 =
5. 7 6 = 15. 8 9 = 5. 9 + 6 = 15. 15 - 8 =
6. 6 + 9 = 16. 9 + 6 = 6. 15 - 9 = 16. 72 8 =
7. 16 - 7 = 17. 9 = 9 7. 8 + 8 = 17. + 7 = 16
8. 6 7 = 18. - 6 = 8 8. 42 7 = 18. 8 = 72
9. 63 7 = 19. + 8 = 15 9. 6 8 = 19. - 6 = 9
10. 15 - 6 = 20. 9 = 54 10. 15 - 7 = 20. 9 = 6
Exercise 81 Exercise 82
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 7 + 6 = 11. 16 - 9 = 1. 6 6 = 11. 7 + 7 =
2. 49 7 = 12. 7 8 = 2. 6 + 8 = 12. 9 6 =
3. 17 - 9 = 13. 56 8 = 3. 56 7 = 13. 9 + 9 =
4. 8 + 9 = 14. 15 - 9 = 4. 13 - 7 = 14. 81 9 =
5. 48 6 = 15. 8 + 6 = 5. 42 7 = 15. 13 - 6 =
6. 9 + 8 = 16. 6 9 = 6. 17 - 9 = 16. 7 9 =
7. 12 - 6 = 17. - 6 = 9 7. 54 6 = 17. 8 = 6
8. 8 7 = 18. 9 = 8 8. 16 - 8 = 18. 7 = 63
9. 16 - 8 = 19. 6 = 54 9. 8 + 6 = 19. - 8 = 9
10. 42 7 = 20. + 7 = 13 10. 8 8 = 20. + 9 = 16
Exercise 83 Exercise 84
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 9 + 6 = 11. 6 + 9 = 1. 72 8 = 11. 48 8 =
2. 16 - 7 = 12. 14 - 6 = 2. 9 + 7 = 12. 15 - 9 =
3. 6 9 = 13. 6 7 = 3. 9 8 = 13. 42 6 =
4. 7 + 8 = 14. 63 7 = 4. 8 + 8 = 14. 6 + 6 =
5. 9 8 = 15. 15 - 6 = 5. 63 9 = 15. 6 8 =
6. 36 6 = 16. 64 8 = 6. 8 6 = 16. 15 - 7 =
7. 14 - 7 = 17. 6 = 42 7. 7 + 9 = 17. + 6 = 15
8. 72 8 = 18. + 7 = 15 8. 13 - 7 = 18. 7 = 49
9. 18 - 9 = 19. 9 = 6 9. 9 9 = 19. 9 = 9
10. 8 9 = 20. - 8 = 6 10. 15 - 8 = 20. - 6 = 9
Exercise 85 Exercise 86
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 6 9 = 11. 49 7 = 1. 13 - 6 = 11. 42 7 =
2. 16 - 7 = 12. 12 - 6 = 2. 7 + 7 = 12. 17 - 9 =
3. 72 9 = 13. 8 7 = 3. 56 8 = 13. 36 6 =
4. 9 6 = 14. 9 + 8 = 4. 9 7 = 14. 7 9 =
5. 6 + 7 = 15. 64 8 = 5. 16 - 8 = 15. 8 + 6 =
6. 15 - 9 = 16. 16 - 9 = 6. 7 + 9 = 16. 8 8 =
7. 7 + 6 = 17. 8 = 56 7. 6 6 = 17. - 8 = 9
8. 17 - 9 = 18. 7 = 6 8. 6 + 8 = 18. 6 = 54
9. 8 + 9 = 19. - 8 = 8 9. 63 7 = 19. + 9 = 18
10. 48 6 = 20. + 6 = 14 10. 13 - 7 = 20. 9 = 6
Exercise 87 Exercise 88
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 18 - 9 = 11. 8 + 7 = 1. 42 6 = 11. 8 6 =
2. 8 9 = 12. 63 9 = 2. 7 + 9 = 12. 49 7 =
3. 54 6 = 13. 6 7 = 3. 15 - 9 = 13. 6 8 =
4. 14 - 7 = 14. 56 7 = 4. 9 9 = 14. 6 + 6 =
5. 72 8 = 15. 9 8 = 5. 9 + 7 = 15. 15 - 6 =
6. 14 - 6 = 16. 14 - 8 = 6. 13 - 7 = 16. 56 8 =
7. 7 + 8 = 17. + 9 = 15 7. 9 8 = 17. - 7 = 9
8. 6 9 = 18. - 6 = 9 8. 8 + 8 = 18. 9 = 8
9. 9 + 6 = 19. 8 = 8 9. 54 9 = 19. 7 = 49
10. 16 - 7 = 20. 6 = 42 10. 15 - 8 = 20. + 6 = 15
Exercise 89 Exercise 90
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 7 8 = 11. 9 6 = 1. 9 6 = 11. 7 + 9 =
2. 48 8 = 12. 6 + 7 = 2. 9 + 9 = 12. 13 - 6 =
3. 17 - 9 = 13. 15 - 9 = 3. 16 - 8 = 13. 42 7 =
4. 8 + 6 = 14. 8 + 9 = 4. 6 6 = 14. 8 8 =
5. 16 - 8 = 15. 12 - 6 = 5. 6 + 8 = 15. 63 7 =
6. 6 9 = 16. 48 6 = 6. 54 9 = 16. 17 - 9 =
7. 56 7 = 17. 7 = 56 7. 13 - 7 = 17. 6 = 9
8. 9 + 8 = 18. + 6 = 13 8. 7 9 = 18. - 8 = 9
9. 42 7 = 19. - 7 = 9 9. 8 + 6 = 19. 7 = 63
10. 16 - 9 = 20. 9 = 9 10. 56 8 = 20. + 7 = 14
Exercise 91 Exercise 92
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 14 - 8 = 11. 63 9 = 1. 13 - 7 = 11. 48 6 =
2. 56 7 = 12. 6 7 = 2. 6 + 6 = 12. 15 - 6 =
3. 15 - 6 = 13. 8 + 7 = 3. 72 8 = 13. 7 7 =
4. 9 8 = 14. 64 8 = 4. 9 9 = 14. 9 + 6 =
5. 7 + 8 = 15. 8 9 = 5. 15 - 8 = 15. 56 7 =
6. 6 9 = 16. 16 - 7 = 6. 8 6 = 16. 7 + 9 =
7. 9 + 6 = 17. + 9 = 15 7. 54 9 = 17. - 9 = 6
8. 14 - 7 = 18. 6 = 42 8. 15 - 7 = 18. + 8 = 16
9. 72 8 = 19. 6 = 6 9. 9 8 = 19. 7 = 6
10. 14 - 6 = 20. - 9 = 9 10. 9 + 7 = 20. 8 = 48
Exercise 93 Exercise 94
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 12 - 6 = 11. 6 9 = 1. 81 9 = 11. 16 - 8 =
2. 8 7 = 12. 16 - 7 = 2. 17 - 8 = 12. 56 8 =
3. 48 8 = 13. 42 6 = 3. 9 7 = 13. 9 + 9 =
4. 9 + 8 = 14. 8 + 6 = 4. 7 + 7 = 14. 42 7 =
5. 42 7 = 15. 16 - 8 = 5. 13 - 7 = 15. 7 + 9 =
6. 16 - 9 = 16. 54 6 = 6. 7 9 = 16. 13 - 6 =
7. 7 + 6 = 17. 6 = 54 7. 8 + 6 = 17. 6 = 54
8. 7 8 = 18. + 7 = 13 8. 8 8 = 18. - 9 = 8
9. 17 - 9 = 19. - 9 = 6 9. 54 9 = 19. + 8 = 14
10. 8 + 9 = 20. 7 = 7 10. 6 6 = 20. 9 = 8
Exercise 95 Exercise 96
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 9 + 6 = 11. 6 + 9 = 1. 8 + 7 = 11. 8 7 =
2. 14 - 8 = 12. 13 - 6 = 2. 6 6 = 12. 54 9 =
3. 8 + 8 = 13. 6 9 = 3. 15 - 8 = 13. 9 8 =
4. 15 - 7 = 14. 42 6 = 4. 9 + 8 = 14. 15 - 9 =
5. 9 6 = 15. 7 7 = 5. 14 - 6 = 15. 9 + 6 =
6. 18 - 9 = 16. 81 9 = 6. 48 6 = 16. 14 - 7 =
7. 56 7 = 17. + 7 = 14 7. 7 + 9 = 17. + 6 = 12
8. 7 + 6 = 18. 8 = 6 8. 63 7 = 18. 8 = 7
9. 9 7 = 19. - 8 = 9 9. 8 8 = 19. 9 = 63
10. 54 9 = 20. 8 = 64 10. 72 9 = 20. - 7 = 9
Exercise 97 Exercise 98
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 16 - 8 = 11. 9 + 7 = 1. 8 + 6 = 11. 36 6 =
2. 54 6 = 12. 7 6 = 2. 6 7 = 12. 17 - 9 =
3. 8 + 9 = 13. 6 + 8 = 3. 14 - 7 = 13. 7 + 8 =
4. 42 7 = 14. 8 9 = 4. 49 7 = 14. 72 8 =
5. 6 8 = 15. 13 - 7 = 5. 9 9 = 15. 8 6 =
6. 15 - 6 = 16. 6 + 6 = 6. 72 9 = 16. 7 + 6 =
7. 63 9 = 17. 7 = 63 7. 12 - 6 = 17. 7 = 6
8. 14 - 7 = 18. 8 = 8 8. 6 + 7 = 18. - 7 = 7
9. 56 8 = 19. + 6 = 13 9. 9 8 = 19. 8 = 56
10. 9 9 = 20. - 9 = 7 10. 81 9 = 20. + 9 = 18
Exercise 99 Exercise 100
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 7 7 = 11. 9 = 54 1. 15 - 9 = 11. 48 = 8
2. 7 + 6 = 12. 18 - = 9 2. 54 9 = 12. 7 + = 16
3. 15 - 7 = 13. 56 = 8 3. 14 - 7 = 13. 56 = 7
4. 48 8 = 14. 7 + = 14 4. 8 7 = 14. 8 = 64
5. 81 9 = 15. 9 = 63 5. 9 + 6 = 15. 72 = 8
6. 8 8 = 16. 54 = 6 6. 7 9 = 16. 8 + = 15
7. 6 + 9 = 17. 9 + = 15 7. 16 - 7 = 17. 6 = 36
8. 13 - 6 = 18. 14 - = 6 8. 6 + 6 = 18. 15 - = 7
9. 6 9 = 19. 8 + = 16 9. 63 7 = 19. 9 + = 17
10. 42 6 = 20. 17 - = 9 10. 9 8 = 20. 14 - = 8
Exercise 101 Exercise 102
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 9 7 = 11. 6 = 48 1. 12 - 6 = 11. 7 = 56
2. 64 8 = 12. 15 - = 9 2. 42 7 = 12. 72 = 9
3. 7 + 6 = 13. 63 = 7 3. 9 + 9 = 13. 8 = 48
4. 7 6 = 14. 14 - = 7 4. 81 9 = 14. 7 + = 13
5. 9 + 7 = 15. 6 + = 14 5. 8 + 6 = 15. 36 = 6
6. 56 8 = 16. 9 = 81 6. 6 7 = 16. 14 - = 7
7. 16 - 9 = 17. 16 - = 8 7. 14 - 7 = 17. 7 + = 15
8. 8 9 = 18. 54 = 9 8. 49 7 = 18. 9 = 72
9. 13 - 7 = 19. 8 + = 17 9. 9 9 = 19. 6 + = 13
10. 6 + 6 = 20. 42 = 6 10. 72 9 = 20. 17 - = 8
Exercise 103 Exercise 104
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 8 8 = 11. 9 = 63 1. 8 7 = 11. 72 = 8
2. 6 + 9 = 12. 54 = 6 2. 9 + 8 = 12. 8 + = 15
3. 13 - 6 = 13. 9 + = 15 3. 14 - 6 = 13. 6 = 36
4. 7 + 7 = 14. 14 - = 6 4. 6 + 6 = 14. 15 - = 6
5. 15 - 7 = 15. 8 + = 16 5. 63 7 = 15. 54 = 6
6. 81 9 = 16. 48 = 6 6. 9 8 = 16. 9 + = 15
7. 6 9 = 17. 9 = 54 7. 15 - 8 = 17. 48 = 8
8. 42 6 = 18. 18 - = 9 8. 56 8 = 18. 7 + = 16
9. 7 7 = 19. 56 = 8 9. 7 9 = 19. 14 - = 7
10. 7 + 6 = 20. 17 - = 9 10. 16 - 7 = 20. 8 = 64
Exercise 105 Exercise 106
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 15 - 6 = 11. 7 = 42 1. 6 + 7 = 11. 8 + = 14
2. 63 9 = 12. 13 - = 6 2. 14 - 7 = 12. 6 = 42
3. 14 - 7 = 13. 7 + = 13 3. 7 8 = 13. 14 - = 7
4. 9 + 7 = 14. 16 - = 7 4. 7 + 8 = 14. 42 = 6
5. 6 8 = 15. 56 = 7 5. 72 8 = 15. 9 = 72
6. 54 6 = 16. 6 + = 14 6. 8 6 = 16. 81 = 9
7. 8 + 9 = 17. 9 = 63 7. 7 + 6 = 17. 9 + = 18
8. 42 7 = 18. 64 = 8 8. 36 6 = 18. 9 = 81
9. 9 9 = 19. 8 = 72 9. 17 - 9 = 19. 72 = 8
10. 16 - 8 = 20. 6 + = 12 10. 49 7 = 20. 12 - = 6
Exercise 107 Exercise 108
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 9 + 6 = 11. 9 = 54 1. 8 8 = 11. 8 = 56
2. 8 8 = 12. 18 - = 9 2. 72 9 = 12. 56 = 7
3. 17 - 8 = 13. 56 = 8 3. 8 + 7 = 13. 7 = 63
4. 8 + 8 = 14. 6 + = 15 4. 15 - 8 = 14. 16 - = 9
5. 15 - 7 = 15. 81 = 9 5. 9 + 8 = 15. 54 = 6
6. 42 6 = 16. 7 + = 14 6. 14 - 6 = 16. 14 - = 7
7. 7 7 = 17. 48 = 6 7. 6 + 6 = 17. 48 = 8
8. 7 + 6 = 18. 13 - = 7 8. 63 7 = 18. 7 + = 16
9. 9 7 = 19. 6 = 54 9. 9 8 = 19. 6 = 36
10. 54 9 = 20. 14 - = 6 10. 9 + 6 = 20. 15 - = 6
Exercise 109 Exercise 110
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 7 + 6 = 11. 15 - = 9 1. 9 8 = 11. 8 = 48
2. 16 - 9 = 12. 63 = 7 2. 7 + 6 = 12. 81 = 9
3. 8 9 = 13. 16 - = 8 3. 49 7 = 13. 6 + = 13
4. 6 + 8 = 14. 56 = 7 4. 9 9 = 14. 17 - = 8
5. 9 7 = 15. 6 = 48 5. 72 9 = 15. 7 + = 15
6. 64 8 = 16. 54 = 9 6. 12 - 6 = 16. 72 = 9
7. 13 - 7 = 17. 8 + = 17 7. 8 + 6 = 17. 14 - = 7
8. 6 + 6 = 18. 42 = 6 8. 6 7 = 18. 36 = 6
9. 7 6 = 19. 9 = 81 9. 14 - 7 = 19. 7 = 56
10. 9 + 7 = 20. 14 - = 7 10. 42 7 = 20. 9 + = 18
Exercise 111 Exercise 112
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 6 9 = 11. 9 = 54 1. 9 + 6 = 11. 6 + = 12
2. 42 6 = 12. 18 - = 9 2. 8 8 = 12. 72 = 8
3. 7 7 = 13. 56 = 8 3. 14 - 7 = 13. 15 - = 6
4. 7 + 6 = 14. 17 - = 9 4. 56 8 = 14. 6 = 36
5. 48 8 = 15. 9 = 63 5. 7 9 = 15. 8 + = 15
6. 8 8 = 16. 9 = 6 6. 16 - 7 = 16. - 8 = 7
7. 6 + 9 = 17. + 6 = 15 7. 9 + 8 = 17. 9 = 6
8. 81 9 = 18. - 8 = 6 8. 8 7 = 18. - 6 = 8
9. 13 - 6 = 19. + 8 = 16 9. 48 6 = 19. 7 = 9
10. 7 + 7 = 20. - 7 = 8 10. 7 + 9 = 20. 8 = 72
Exercise 113 Exercise 114
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 6 8 = 11. 7 + = 13 1. 9 + 9 = 11. 36 = 6
2. 54 6 = 12. 16 - = 7 2. 9 9 = 12. 17 - = 8
3. 8 + 9 = 13. 9 + = 16 3. 72 9 = 13. 49 = 7
4. 42 7 = 14. 64 = 8 4. 12 - 6 = 14. 8 + = 14
5. 9 9 = 15. 8 = 72 5. 7 8 = 15. 6 = 42
6. 16 - 8 = 16. 8 = 7 6. 7 + 8 = 16. - 7 = 7
7. 15 - 6 = 17. 7 = 63 7. 14 - 7 = 17. 8 = 72
8. 63 9 = 18. 6 = 42 8. 42 7 = 18. 6 = 48
9. 14 - 7 = 19. - 7 = 6 9. 7 + 6 = 19. 9 = 9
10. 6 + 8 = 20. + 6 = 12 10. 72 8 = 20. + 7 = 13
Exercise 115 Exercise 116
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 14 - 7 = 11. 14 - = 6 1. 8 + 8 = 11. 54 = 6
2. 8 + 7 = 12. 7 + = 15 2. 42 7 = 12. 15 - = 8
3. 63 9 = 13. 6 = 54 3. 6 8 = 13. 6 + = 12
4. 8 9 = 14. 72 = 9 4. 9 + 6 = 14. 9 = 72
5. 16 - 7 = 15. 14 - = 8 5. 56 7 = 15. 15 - = 7
6. 6 + 9 = 16. 8 = 72 6. 7 + 9 = 16. 6 = 48
7. 36 6 = 17. 7 = 8 7. 15 - 9 = 17. - 7 = 6
8. 18 - 9 = 18. - 6 = 9 8. 48 6 = 18. + 7 = 16
9. 64 8 = 19. + 6 = 15 9. 15 - 6 = 19. 8 = 9
10. 7 6 = 20. 7 = 42 10. 7 7 = 20. 9 = 81
Exercise 117 Exercise 118
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 8 + 6 = 11. 7 = 56 1. 13 - 6 = 11. 13 - = 6
2. 16 - 8 = 12. 17 - = 8 2. 7 9 = 12. 56 = 7
3. 54 6 = 13. 8 + = 17 3. 42 7 = 13. 9 = 63
4. 16 - 7 = 14. 42 = 6 4. 6 + 8 = 14. 7 + = 14
5. 42 6 = 15. 16 - = 7 5. 72 9 = 15. 81 = 9
6. 9 6 = 16. 8 = 6 6. 8 8 = 16. 6 = 54
7. 6 + 7 = 17. - 6 = 6 7. 9 + 9 = 17. + 6 = 14
8. 15 - 9 = 18. 7 = 56 8. 17 - 9 = 18. - 8 = 9
9. 9 + 8 = 19. + 6 = 13 9. 7 + 9 = 19. 9 = 6
10. 49 7 = 20. 9 = 54 10. 16 - 8 = 20. 6 = 36
Exercise 119 Exercise 120
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 17 - 8 = 11. 8 = 48 1. 7 6 = 11. 48 = 8
2. 8 + 9 = 12. 8 + = 16 2. 18 - 9 = 12. 7 + = 15
3. 7 8 = 13. 72 = 8 3. 9 + 6 = 13. 6 = 54
4. 13 - 6 = 14. 7 = 63 4. 63 7 = 14. 12 - = 6
5. 42 7 = 15. 7 + = 14 5. 9 8 = 15. 63 = 7
6. 6 8 = 16. - 7 = 7 6. 16 - 8 = 16. - 7 = 7
7. 54 6 = 17. 8 = 7 7. 9 7 = 17. + 7 = 13
8. 15 - 7 = 18. + 9 = 18 8. 48 8 = 18. - 6 = 7
9. 6 + 6 = 19. 7 = 63 9. 8 + 9 = 19. 9 = 6
10. 36 6 = 20. - 9 = 6 10. 15 - 8 = 20. 7 = 56
Exercise 121 Exercise 122
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 17 - 9 = 11. 16 - = 9 1. 16 - 7 = 11. 7 + = 13
2. 7 7 = 12. 42 = 7 2. 8 9 = 12. 81 = 9
3. 9 + 7 = 13. 9 = 81 3. 49 7 = 13. 8 + = 15
4. 54 9 = 14. 8 + = 14 4. 6 7 = 14. 14 - = 8
5. 15 - 6 = 15. 56 = 8 5. 13 - 7 = 15. 7 = 56
6. 81 9 = 16. 8 = 64 6. 48 6 = 16. + 8 = 17
7. 6 + 6 = 17. - 7 = 6 7. 16 - 9 = 17. 8 = 72
8. 6 8 = 18. + 8 = 14 8. 36 6 = 18. - 9 = 8
9. 15 - 8 = 19. 6 = 36 9. 6 + 9 = 19. 8 = 8
10. 7 + 9 = 20. 8 = 9 10. 9 6 = 20. - 8 = 6
Exercise 123 Exercise 124
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 6 9 = 11. 7 = 8 1. 6 6 = 11. + 9 = 16
2. 42 6 = 12. + 8 = 16 2. 15 - 9 = 12. - 7 = 7
3. 7 7 = 13. - 7 = 8 3. 54 9 = 13. 8 = 72
4. 14 - 8 = 14. 7 = 63 4. 9 + 6 = 14. - 8 = 7
5. 7 + 7 = 15. 9 = 6 5. 48 6 = 15. 8 = 7
6. 81 9 = 16. + 6 = 15 6. 14 - 6 = 16. 9 = 63
7. 9 6 = 17. 8 = 64 7. 8 + 7 = 17. - 7 = 9
8. 18 - 9 = 18. + 9 = 15 8. 8 7 = 18. + 6 = 12
9. 7 + 6 = 19. - 6 = 7 9. 9 + 8 = 19. 7 = 9
10. 17 - 8 = 20. 8 = 6 10. 72 9 = 20. 8 = 64
Exercise 125 Exercise 126
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 9 7 = 11. + 9 = 17 1. 81 9 = 11. 8 = 56
2. 64 8 = 12. 7 = 6 2. 9 + 9 = 12. + 8 = 15
3. 13 - 7 = 13. 9 = 81 3. 14 - 7 = 13. 8 = 9
4. 7 6 = 14. - 8 = 8 4. 72 9 = 14. 9 = 81
5. 9 + 7 = 15. 8 = 48 5. 12 - 6 = 15. - 7 = 7
6. 54 6 = 16. + 8 = 14 6. 8 + 6 = 16. 6 = 48
7. 6 + 6 = 17. - 6 = 9 7. 6 7 = 17. + 6 = 13
8. 8 9 = 18. 9 = 7 8. 6 + 7 = 18. 6 = 6
9. 7 + 6 = 19. - 7 = 7 9. 42 7 = 19. - 9 = 8
10. 16 - 9 = 20. 8 = 7 10. 9 8 = 20. 7 = 7
Exercise 127 Exercise 128
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 6 9 = 11. - 9 = 9 1. 9 + 6 = 11. 9 = 63
2. 42 6 = 12. 7 = 8 2. 48 6 = 12. - 7 = 9
3. 7 7 = 13. - 8 = 9 3. 7 + 9 = 13. 9 = 8
4. 7 + 6 = 14. 8 = 6 4. 14 - 7 = 14. + 8 = 17
5. 8 8 = 15. + 8 = 16 5. 8 8 = 15. 9 = 6
6. 6 + 9 = 16. 7 = 63 6. 14 - 6 = 16. 7 = 56
7. 13 - 6 = 17. 9 = 6 7. 6 + 6 = 17. + 7 = 15
8. 7 + 7 = 18. + 6 = 15 8. 63 7 = 18. 6 = 36
9. 14 - 8 = 19. - 7 = 8 9. 9 8 = 19. - 9 = 6
10. 81 9 = 20. 6 = 54 10. 15 - 8 = 20. 8 = 7
Exercise 129 Exercise 130
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 6 + 8 = 11. 6 = 42 1. 12 - 6 = 11. - 9 = 8
2. 9 7 = 12. 9 = 7 2. 81 9 = 12. 7 = 7
3. 64 8 = 13. 9 = 81 3. 9 + 9 = 13. - 7 = 7
4. 8 + 9 = 14. - 8 = 8 4. 9 9 = 14. 7 = 6
5. 54 6 = 15. 9 = 72 5. 72 9 = 15. + 6 = 14
6. 6 8 = 16. 8 = 7 6. 9 8 = 16. 7 = 42
7. 7 + 6 = 17. - 7 = 7 7. 14 - 7 = 17. + 7 = 13
8. 16 - 9 = 18. + 6 = 12 8. 7 + 8 = 18. 8 = 56
9. 9 + 7 = 19. - 6 = 9 9. 72 8 = 19. + 6 = 13
10. 13 - 7 = 20. 7 = 6 10. 8 6 = 20. 6 = 6
Exercise 131 Exercise 132
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 18 - 9 = 11. 9 = 54 1. 7 9 = 11. + 6 = 15
2. 56 7 = 12. 6 = 7 2. 16 - 7 = 12. 6 = 8
3. 17 - 8 = 13. 7 = 49 3. 72 9 = 13. + 9 = 16
4. 48 8 = 14. + 6 = 13 4. 9 + 8 = 14. - 7 = 7
5. 8 + 8 = 15. 8 = 64 5. 54 9 = 15. 8 = 64
6. 9 7 = 16. + 9 = 15 6. 8 7 = 16. - 6 = 8
7. 54 9 = 17. - 6 = 7 7. 8 + 7 = 17. + 6 = 12
8. 9 + 6 = 18. + 7 = 14 8. 6 6 = 18. 7 = 9
9. 15 - 7 = 19. - 8 = 6 9. 15 - 9 = 19. 8 = 72
10. 9 6 = 20. 9 = 9 10. 56 8 = 20. - 8 = 7
Exercise 133 Exercise 134
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 7 6 = 11. + 8 = 14 1. 17 - 9 = 11. 8 = 72
2. 63 9 = 12. 7 = 63 2. 49 7 = 12. 9 = 9
3. 9 9 = 13. 8 = 8 3. 14 - 7 = 13. - 6 = 6
4. 16 - 8 = 14. + 9 = 17 4. 42 7 = 14. 9 = 81
5. 8 9 = 15. 6 = 9 5. 8 + 6 = 15. 9 = 8
6. 56 8 = 16. 8 = 48 6. 6 7 = 16. + 9 = 18
7. 14 - 7 = 17. + 6 = 13 7. 6 + 7 = 17. - 7 = 7
8. 6 + 6 = 18. - 9 = 7 8. 7 8 = 18. + 8 = 15
9. 15 - 6 = 19. + 7 = 16 9. 7 + 6 = 19. 8 = 9
10. 42 7 = 20. - 7 = 6 10. 36 6 = 20. 6 = 48
Exercise 135 Exercise 136
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 18 - = 9 11. 8 = 64 1. 17 - = 8 11. 9 = 81
2. 56 = 8 12. + 9 = 15 2. 49 = 7 12. + 8 = 15
3. 17 - = 9 13. - 6 = 7 3. 14 - = 7 13. 8 = 9
4. 48 = 6 14. + 7 = 14 4. 42 = 6 14. 6 = 48
5. 8 + = 16 15. 9 = 54 5. 8 + = 14 15. - 7 = 7
6. 9 = 63 16. 6 = 7 6. 6 = 42 16. 9 = 8
7. 54 = 6 17. - 8 = 6 7. 6 + = 13 17. - 6 = 6
8. 9 + = 15 18. 9 = 9 8. 7 = 56 18. 8 = 72
9. 15 - = 8 19. 7 = 49 9. 7 + = 13 19. 9 = 9
10. 9 = 54 20. + 6 = 13 10. 36 = 6 20. + 9 = 18
Exercise 137 Exercise 138
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 7 = 63 11. 7 = 9 1. 7 = 42 11. + 6 = 13
2. 16 - = 9 12. + 6 = 15 2. 63 = 7 12. - 9 = 7
3. 72 = 8 13. - 8 = 7 3. 9 = 81 13. + 7 = 16
4. 9 + = 17 14. 8 = 64 4. 16 - = 8 14. - 7 = 6
5. 54 = 6 15. - 6 = 8 5. 8 = 72 15. 8 = 48
6. 8 = 56 16. + 6 = 12 6. 56 = 7 16. + 9 = 17
7. 8 + = 15 17. 8 = 72 7. 14 - = 7 17. 6 = 9
8. 6 = 36 18. 6 = 8 8. 6 + = 12 18. + 8 = 14
9. 15 - = 6 19. + 9 = 16 9. 15 - = 9 19. 7 = 63
10. 56 = 7 20. - 7 = 7 10. 42 = 6 20. 8 = 8
Exercise 139 Exercise 140
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 6 = 54 11. + 9 = 15 1. 6 = 36 11. 9 = 63
2. 42 = 7 12. - 6 = 7 2. 15 - = 6 12. - 7 = 9
3. 7 = 49 13. 8 = 6 3. 54 = 6 13. + 6 = 12
4. 7 + = 13 14. - 7 = 8 4. 9 + = 15 14. 7 = 9
5. 14 - = 6 15. + 6 = 15 5. 14 - = 8 15. 8 = 64
6. 81 = 9 16. 8 = 64 6. 72 = 8 16. + 9 = 16
7. 9 = 54 17. 7 = 8 7. 8 + = 15 17. - 8 = 7
8. 18 - = 9 18. + 8 = 16 8. 8 = 56 18. 8 = 7
9. 7 + = 14 19. 9 = 6 9. 9 + = 17 19. 8 = 72
10. 17 - = 9 20. 7 = 63 10. 48 = 8 20. - 7 = 7
Exercise 141 Exercise 142
Duration: 5 minutes (maximum) Date: ………………… Duration: 5 minutes (maximum) Date: …………………
1. 9 = 63 11. + 9 = 17 1. 81 = 9 11. 6 = 48
2. 64 = 8 12. 7 + = 13 2. 9 + = 18 12. 8 = 9
3. 13 - = 6 13. - 7 = 7 3. 9 = 72 13. + 6 = 13
4. 6 + = 12 14. 8 = 7 4. 72 = 8 14. 6 = 6
5. 8 = 72 15. 9 = 81 5. 12 - = 6 15. - 9 = 8
6. 54 = 9 16. - 8 = 8 6. 8 + = 14 16. 7 = 7
7. 7 = 42 17. 8 = 48 7. 6 = 42 17. 9 = 81
8. 9 + = 16 18. + 8 = 14 8. 14 - = 7 18. - 7 = 7
9. 9 = 7 19. - 6 = 9 9. 42 = 6 19. + 8 = 15
10. 16 - = 7 20. 7 = 6 10. 6 + = 13 20. 8 = 56
Exercise 143 Exercise 144