Std : 9 2013 1 · In a hostel the consumption of wheat by 170 students in 6 month is 5100 kg. Find the wheat required for 64 student in the same period. (a) 1820 kg (b) 1920 kg (c)

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


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


(c) 18 (d) 24


(c) 11 (d) 12

27. 9845 × 16 = ______(a) 157520 (b) 157420

(c) 157620 (d) 157720


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


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


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


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


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


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


Documents

Std : 9 2013 1 · In a hostel the consumption of wheat by 170 students in 6 month is 5100 kg. Find the wheat required for 64 student in the same period. (a) 1820 kg (b) 1920 kg (c)