Arithmatic(NUMBERS) notes by Santosh Sharma (GS COSMOS CAREERS)
1. Which one of the following is not a prime number?
A. 31
B. 61
C. 71
D. 91
2. (112 x 54) = ?
A. 67000
B. 70000
C. 76500
D. 77200
3. It is being given that (232 + 1) is completely divisible by a whole number. Which of the following numbers is completely divisible by this number?
A. (216 + 1)
B. (216 - 1)
C. (7 x 223)
D. (296 + 1)
4. What least number must be added to 1056, so that the sum is completely divisible by 23 ?
A. 2
B. 3
C. 18
D. 21
E. None of these
5. 1397 x 1397 = ?
A. 1951609
B. 1981709
C. 18362619
D. 2031719
E. None of these
6. How many of the following numbers are divisible by 132 ?
264, 396, 462, 792, 968, 2178, 5184, 6336
A. 4
B. 5
C. 6
D. 7
7. (935421 x 625) = ?
A. 575648125
B. 584638125
C. 584649125
D. 585628125
8. The largest 4 digit number exactly divisible by 88 is:
A. 9944
B. 9768
C. 9988
D. 8888
E. None of these
9. Which of the following is a prime number ?
A. 33
B. 81
C. 93
D. 97
10. What is the unit digit in {(6374)1793 x (625)317 x (341491)}?
A. 0
B. 2
C. 3
D. 5
11. 5358 x 51 = ?
A. 273258
B. 273268
C. 273348
D. 273358
12. The sum of first five prime numbers is:
A. 11
B. 18
C. 26
D. 28
13. The difference of two numbers is 1365. On dividing the larger number by the smaller, we get 6 as quotient and the 15 as remainder. What is the smaller number ?
A. 240
B. 270
C. 295
D. 360
14. (12)3 x 64 ÷ 432 = ?
A. 5184
B. 5060
C. 5148
D. 5084
E. None of these
15. 72519 x 9999 = ?
A. 725117481
B. 674217481
C. 685126481
D. 696217481
E. None of these
16. If the number 517 * 324 is completely divisible by 3, then the smallest whole number in the place of * will be:
A. 0
B. 1
C. 2
D. None of these
17. The smallest 3 digit prime number is:
A. 103
B. 107
C. 109
D. 113
E. None of these
18. Which one of the following numbers is exactly divisible by 11?
A. 235641
B. 245642
C. 315624
D. 415624
19. (?) - 19657 - 33994 = 9999
A. 63650
B. 53760
C. 5940
D. 61560
E. None of these
20. The sum of first 45 natural numbers is:
A. 1035
B. 1280
C. 2070
D. 2140
ANSWERS:
1. Answer: Option D
Explanation:
91 is divisible by 7. So, it is not a prime number.
2. Answer: Option B
Explanation:
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