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Problems on Numbers for Exam

Q21. Find the unit digit in the product (545 X 432 X 326)
(a) 0
(b) 1
(c) 2
(d) 10

Q22. The unit digit in (365 X 659 X 771) is
(a) 1
(b) 2
(c) 3
(d) 4

Q23. (45 + 46 + 47 + ⋅ ⋅ ⋅ ⋅ ⋅ + 113 + 114 + 115) = ?
(a) 5120
(b) 5570
(c) 5680
(d) 8650

Q24. A, B, C and D are four consecutive odd integers and their average is 32. What is the product of B and D ?
(a) 1085
(b) 1508
(c) 1805
(d) 1580

Q25. A, B, C and D are four consecutive even integers and their average is 62. What is the product of A and C ?
(a) 3717
(b) 3771
(c) 3777
(d) None of the above



Q26. 106 X 106 - 94 X 94 = ?
(a) 2000
(b) 2400
(c) 1904
(d) 1906

Q27.

5 X 2 ÷ 4 ÷ 6
6 9 9 7

(a) 0.44
(b) 0.32
(c) 0.49
(d) 0.36

Q28. 8988 ÷ 8 ÷ 4 = ?
(a) 266.336
(b) 272.156
(c) 280.875
(d) 281.997

Q29. The sum and product of two numbers are 15 and 45 respectively. The sum of their reciprocals is
(a) 1/2
(b) 1/3
(c) 1/7
(d) 3/5

Q30. The first prime number is
(a) 0
(b) 2
(c) 1
(d) 3


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