Arithmatic (NUMBERS) notes, solved paper

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: