PRACTICE PAPER 8PRIMARY 3 MATHEMATICS

Answer KeySection A:Qn Qn Qn Qn1. 4 6. 4 11. 1 16. 12. 1 7. 3 12. 2 17. 43. 1 8. 1 13. 2 18. 14. 1 9. 4 14. 4 19. 35. 1 10. 3 15. 3 20. 2

Section B:Qn21 72322 1000 + 7893 (M1)

= 8893 (A1)

23 256 x 9 (M1)= 2304 (A1)

24 1400 – 243 = 1157 (M1)1157 + 1400 = 2557 (A1)

25 43 + 18 = 61(M1)61 + 18 = 79 (A1)

26 378 ÷ 6 = 63 (M1, A1)

27 30 – 3 = 27 (M1)27 + 15 = 42 (A1)

28 48 ÷ 4 =12 (M1)12 x 2 = 24 (A1)

Or

48 ÷ 2 =24 (M1, A1)

29 3 x $50 = $1507 x $10 = $70150 + 170 = 220 (M1)220 – 157 = $63 (A1)

30 4000 + 502 = 4502 (M1)4502 m = 4 km 502 m (A1)

31 A: 12 X 9 = 108B: 11 X 9 = 99

32 25 x 2 = 50530 – 50 = 480 (M1)480 ÷ 4 = 120 (A1)

33 4, 8, 12, 16, 20, 24, 28, 328, 16, 24, 32, 40,

(Able to list the multiplication of 4 and 8 correctly, will be awarded M1)A1 for final answer, 16 or 24

34 18 ÷ 2 = 9 (M1)9 x 5 = 45 (A1)

35 156 x 2 = 312 (M1)312 – 28 = 284 (A1)

36 500 cm – 186 cm = 314 cm314 cm – 80 cm = 234 cm (M1)2 m 34 cm (A1)

37

1 kg + 1 kg + 200 g = 2 kg 200 g (M1)2000 g + 200 g = 2200 g (A1)

38

2 units 554 – 100 – 100 – 100= 254 (M1)

1 unit 254 ÷ 2= 127(A1)

39 12 x 6 = 72 ℓ (M1)72 ÷ 4 = 18 (A1)

40

4 rugs 108 x 3= 324 (M1)

1 rug 324 ÷ 4= 81 (A1)

200 g

1kg

1kg 1kg

?

100 100 100

100

c c c

r r r r

$108

A

B

554

D

M

B

Section C:

41.

3 pants

$225

4 shirts

7 units 225 – 15 …………………..M1= 210

1 unit 210 ÷ 7……………………..M1= 30

4 units 30 x 4……………………...M1= $120 (penalise half mark for omission of units)…………....A1

42. 1500

M

F 2842

C

1500 – 400 ………………………………M1= 1100 (female)

2842 – 1500 – 1100 …………………….M2= 242……………………………………....A1

Or

1500 – 400………………………………..M1= 1100 (female)

1500 + 1100 ……………………………...M1= 2600 (female and male)

2842 – 2600 ……………………………...M1= 242………………………………………A1

Or

1500 – 400 = 1100 ……………………………...M1

1100 + 1500 = 2600 ……………………………...M1

2842 – 2600 = 242 ……………………………...M1, A1

$5

$5

$5

4001100

?

1100

43.1374

A

B

2 units 1374 – 340 ……………………M1= 1034

1 unit 1034 ÷ 2…………………………M1= 517

3 units 517 x 3………………………….M1= 1551…………………………..A1

Or

2 units 1374 – 340 ……………………M1= 1034

1 unit 1034 ÷ 2…………………………M1= 517

517 – 340 ………………………………….M1= 177

1374 + 177 = 1551………………………………………A1

44. ?

Ro

S

Ri 198

(a) 2 units 1981 unit 198 ÷ 2 ……………………M1

= 99 cm (penalise half mark for omission of units)……….....A1

(b) 9 units 99 x 9 …………………….M1= 891 cm

891 = 8 m 91 cm (penalise half mark for omission of units)……….....……...A1

340

340

45.

3577g

1971

1606

803 x 2 ………………………………………….M1= 1606 (2 boxes and 2 flower vases)

3577 – 1606 ……………………………………M1= 1971 (3 boxes)

1971 ÷ 3 ………………………………………...M1= 657g(penalise half mark for omission of units)…………………..A1

B B B B B

V V