Std : 9 2013 1 · In a hostel the consumption of wheat by 170 students in 6 month is 5100 kg. Find...
Transcript of Std : 9 2013 1 · In a hostel the consumption of wheat by 170 students in 6 month is 5100 kg. Find...
Std : 9 1Mental Maths Competition® 2013
SECTION 1 (Mental Maths Calculation)
1. (36 × 14) + (36 × 52) = _____(a) 2276 (b) 2176
(c) 2376 (d) 2476
2. (96 × 32) – (96 × 15) = _____(a) 1632 (b) 1532
(c) 1432 (d) 1732
3. (13 × 33) + (8 × 6) + (19 × 18)=_____(a) 809 (b) 819
(c) 829 (d) 839
4. (62 × 4) + (83 × 3) – (34 × 4)=_____(a) 371 (b) 351
(c) 341 (d) 361
5. (83 × 5) – (37 × 5) + (14 × 8)=_____(a) 322 (b) 332
(c) 342 (d) 352
6. (25% of 176) + (50% of 184) =_____(a) 136 (b) 126
(c) 146 (d) 156
7. (50% of 178) – (25% of 148)=_____(a) 72 (b) 62
(c) 42 (d) 52
8. (50% of 164) + (25% of 40)–(20% of 160 ) = _____(a) 75 (b) 60
(c) 95 (d) 65
9. (half of 260) + (one thirdof 150) = _____(a) 170 (b) 160
(c) 180 (d) 190
10. (one third of 390) – (half of156) = _____(a) 52 (b) 42
(c) 62 (d) 32
11. square of 37 + square 12 =_____(a) 1413 (b) 1513
(c) 1613 (d) 1713
12. square of 75 – square 25 =_____(a) 4000 (b) 3000
(c) 6000 (d) 5000
13. square of 40 + square of 15– square of 20 = _____(a) 1325 (b) 1225
(c) 1425 (d) 1525
Std : 9 2Mental Maths Competition® 2013
14. square of 17 – square rootof 676 = _____(a) 263 (b) 253
(c) 273 (d) 243
15. square of 38 + cube root of512 = _____(a) 1432 (b) 1438
(c) 1434 (d) 1452
16. square root of 256 + cubeof 7 = _____(a) 349 (b) 359
(c) 369 (d) 379
17. cube of 6 + square root1225 =(a) 271 (b) 241
(c) 261 (d) 251
18. Sum of all the divisor of 46= _____(a) 70 (b) 74
(c) 72 (d) 68
19. Sum of all the divisor of 32(a) 63 (b) 61
(c) 65 (d) 59
20. Sum of all prime divisors of2550(a) 31 (b) 25
(c) 29 (d) 27
21. Select the greatest numberfrom the given operations.(a) 93 × 4 (b) 432 – 43
(c) 218 + 148 (d) 24 × 14
22. Select the smallest numberfrom the given operations.(a) 39 × 2 (b) 163 – 84
(c) 168 ÷ 3 (d) 14 × 17
23. If 345 is divided by 25, theremainder is ______(a) 20 (b) 10
(c) 15 (d) 5
24. If 978 is divided by 12 , theremainder is ______(a) 4 (b) 5
(c) 7 (d) 6
25. If 1894 is divided by 36, theremainder is ______(a) 20 (b) 22
(c) 18 (d) 24
26. If 1345 is divided by 23, theremainder is ______(a) 10 (b) 9
(c) 11 (d) 12
27. 9845 × 16 = ______(a) 157520 (b) 157420
(c) 157620 (d) 157720
Std : 9 3Mental Maths Competition® 2013
28. 1064 × 46 = ______(a) 48844 (b) 48744
(c) 48644 (d) 48944
29. 3.65 × 1.4 = ______(a) 5.11 (b) 5.21
(c) 5.31 (d) 5.41
30. 5.26 × 1.6 = ______(a) 8.5 (b) 8.4
(c) 9.5 (d) 7.4
31. H.C.F. of 68, 85, 119 is______(a) 3 (b) 12
(c) 14 (d) 17
32. L.C.M. of 34, 85 and 17 is______(a) 240 (b) 170
(c) 510 (d) 480
33. 6 – 2.008 = ______(a) 3.892 (b) 3.792
(c) 3.992 (d) 3.692
34. 14.76 + 42.84 – 16.19 =____(a) 41.41 (b) 40.41
(c) 42.41 (d) 39.41
35. 2 41
+ 351
=
(a) 4 209
(b) 3 209
(c) 6 209
(d) 5 209
36. – 1 32
= 65
(a) 2 23
(b) 3 21
(c) 2 21
(d) 4 21
37. (1.28 × 4.6) + (6.1 × 2.18) =______(a) 19.186 (b) 19.176
(c) 19.196 (d) 19.166
38. Double of 3412 = ______(a) 6924 (b) 6724
(c) 6624 (d) 6824
39. Half of 3984 = ______(a) 1892 (b) 1982
(c) 1972 (d) 1992
40. The ratio of 35 min to35 hour is ______(a) 1:16 (b) 1:30
(c) 1:60 (d) 1:10
Std : 9 4Mental Maths Competition® 2013
SECTION 2(Mental Maths Concepts)
41. 7y6
= 356
then y =
(a) 0.2 (b) 0.1
(c) 0.3 (d) 0.4
42. The ratio of 2 meter: 70 cmis ______(a) 20:5 (b) 4:7
(c) 9:7 (d) 20:7
43. The ratio of ` 3:50 paise =______(a) 1:6 (b) 6:1
(c) 3:6 (d) 6:3
44. 3t = 10t – 14, t = ______
(a) 1 (b) 3
(c) 2 (d) 4
45. Find the number whose 25%is 75.(a) 300 (b) 290
(c) 310 (d) 320
46. 464288
=
(a) 2916
(b) 2917
(c) 2915
(d) 2918
47. Find nineth term in thegiven series.26, 40, 54, 68, ___, ___, ___(a) 166 (b) 124
(c) 152 (d) 138
48. 76
÷ 2112
× 149
=
(a) 147
(b) 1410
(c) 2827
(d) 1411
49. 8 × 34 + 9 × 13 = ______
(a) 389 (b) 379
(c) 399 (d) 409
50. 123 × 84 + 123 × 16 = ______(a) 12400 (b) 12500
(c) 12600 (d) 12300
51. 140 × 10 ÷ (14 × 5 )= ______(a) 10 (b) 15
(c) 20 (d) 25
52. 98 – (63 – 114) = ______(a) 149 (b) –149
(c) 47 (d) – 47
Std : 9 5Mental Maths Competition® 2013
53. – 6 + = 15
(a) –21 (b) 9
(c) –9 (d) 21
54. (205 – 343) ÷ 23 = ______(a) –7 (b) 6
(c) 5 (d) – 6
55. (15) × (2) + (– 3) × (5) ÷ (1)(a) 10 (b) 20
(c) 15 (d) 25
56. 10.75 ÷ 1.25 = ______(a) 8.6 (b) 8.4
(c) 8.3 (d) 8.5
57. 756 ÷ 1.2 = ______(a) 620 (b) 630
(c) 640 (d) 650
58. 42:54 = 7: ______
(a) 12 (b) 15
(c) 8 (d) 9
59. If 5 bags of Soyabeen seedscost ` 2790. Find the cost of3 such bags.(a) 1774 (b) 1574
(c) 1674 (d) 1474
60. The perimeter of triangle is59 cm, if one of its side is25 cm. If the other two sideare equal find their lengths.(a) 17 cm (b) 22 cm
(c) 12 cm (d) 27 cm
Std : 9 6Mental Maths Competition® 2013
SECTION 3 (Mental Maths Challenge)
61. Simplify:- 3 21
–
411
82
85
51
=
(a) 2 4019
(b) 4 4012
(c) 2 4013
(d) 5 4013
62. In an office 10 clerks get a salary of ` 2400 each & 5 officers get asalary of ` 12000 each. Find the average salary of the employee inthe office.(a) ̀ 5500 (b) ̀ 5600 (c) ̀ 5400 (d) ̀ 5200
63. If two complementary angles are in the ratio 2:7. Find the smallerone.(a) 300 (b) 100 (c) 200 (d) 700
64. The perimeter of a rectangular field is 250 m. If the length is75 m, find its area.(a) 4850 sqm (b) 4750 sqm (c) 2750 sqm (d) 3750 sqm
65. There were only two candidates in an election. One got 65% voteselected by a margin of 150 votes. The total number votes were(a) 400 (b) 500 (c) 300 (d) 600
Std : 9 7Mental Maths Competition® 2013
66. Aryan bought an old motor cycle for `16000 and spent ̀ 2000 forits repairs. For how much shall be sale it to earn profit of 10%?(a) ̀ 18000 (b) ̀ 19800 (c) ̀ 19000 (d) ̀ 20000
67. To make 65 dresses 552.5 m of cloth was used to make 85dresses how much of cloth will be required?(a) 722.5 m (b) 725 m (c) 720 m (d) 730 m
68. 4[12.3 + {(7.2 + 2.8) × 2 + (6.9 – 4.5)}] =(a) 208.8 (b) 198.8 (c) 178.8 (d) 138.8
69. In a hostel the consumption of wheat by 170 students in 6 monthis 5100 kg. Find the wheat required for 64 student in the sameperiod.(a) 1820 kg (b) 1920 kg (c) 1720 kg (d) 2020 kg
70. The ratio of income to expenditure of Mr. Rane is 4:3. Find hissaving if his income is ̀ 16000.(a) ̀ 2000 (b) ̀ 3000 (c) ̀ 4000 (d) ̀ 5000
Std : 9 8Mental Maths Competition® 2013
71. Ram, Ravina, Nikhil and Nikita are respectively 12 yrs2 months, 13 years 4 months, 13 year 8 months and 14 years2 months old. Find their average age.(a) 13 yrs (b) 12 yrs 9 months
(c) 13 yrs 4 months (d) 13 yrs 8 months
72. The H.C.F and L.C.M. of two number are 9 and 180 respectively.If one of the number is 45, find the other one.(a) 72 (b) 36 (c) 40 (d) 108
73. Tanuja borrows a sum of ̀ 4400 from Richa at the rate of 8% p.a.After 1 year 6 months, how much simple interest will he have topay?(a) ` 314 (b) ̀ 284 (c) ` 528 (d) ̀ 344
74. There are 4500 books in a library. If 12% new books werepurchased and 600 old books were discarded, how many bookswere left in the liabrary?(a) 4440 (b) 4340 (c) 4240 (d) 4540
75. Simplify: - 215491728 – 159762142 + 681492473(a) 651839743 (b) 785722243 (c) 745817394 (d) 737222059
Std : 9 9Mental Maths Competition® 2013