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#### Olympiad Mathematics class 6th Playing with Numbers

I.M.O. By Suraj Sir

Accent Coaching Institute Hisar

**The two numbers which have only 1 as their common factor are called __________**

a) Co-primes

b) Twin Primes

c) Composite

d) Even numbers**The numbers which have only two factors (1 and the number itself) are called as _____**

a) Composite

b) Even

c) Prime

d) None of these**The number 3 , 116 , 365 is divisible by…………**

a) 5

b) 7

c) Both 5 & 7

d) None of these**The least number which when decreased by 9 is exactly divisible by 12, 16, 24 and 48 is ……..**

a) 16

b) 48

c) 57

d) 39**Which of the following numbers is a perfect square?**

a) 36

b) 81

c) 37

d) Both (A) and (B)**Find the greatest number which will divide the greatest 4-digit number and the greatest 5-digit number exactly.**

a) 9

b) 8

c) 7

d) 3**1265 is divisible by …………**

a) 2

b) 3

c) 10

d) 11**Prime factorisation of 13915 is……….**

a) 5 × 11 × 11 × 23

b) 5 × 11 × 7 × 23

c) 11 × 7 × 23 × 3

d) 5 × 11 × 11 × 3**The HCF and LCM of two numbers is 16 and 192 respectively. If one of the numbers is 64, the other number is …….**

a) 48

b) 24

c) 72

d) 45**The number (9,8) are ______ numbers.**

a) Co-prime

b) Prime

c) Both prime and co-prime

d) None of these**The co-prime number from the following pairs, is __________**

a) 7 and 63

b) 36 and 25

c) 35 and 21

d) 63 and 81**What least value should be given to # so that the number 653#47 is divisible by 11 ?**

a) 9

b) 6

c) 7

d) 1**700608000 + 109003 is divisible by __________**

a) 7

b) 3

c) 9

d) 11**The HCF of two number is 28 and LCM is 336.If one number is 112, then other number is ____**

a) 64

b) 84

c) 34

d) 92**The two consecutive prime number with difference 2 are called ____________**

a) co-prime

b) Twin prime

c) composite

d) Even**The smallest number which when divided by 20 , 25 , 35 and 40 leaves a remainder of 14 , 19 , 29 , and 34 respectively is _________**

a) 1394

b) 1404

c) 1664

d) 1406**The number which are not multiples of 2 are called ________ numbers.**

a) Even

b) odd

c) Prime

d) Composite**Two Tankers contains 850 litres and 680 litres of kerosene oil Respectively , then the maximum capacity of a container which can measure the kerosene out of both the tankers when used an Exact number of times is ___________**

a) 170 litres

b) 85 litres

c) 34 litres

d) 10 litresAnwers

1. A

2.C

3.C

4.C

5.D

6.A

7.D

8.A

9.A

10.A

11.B

12.D

13.D

14.B

15.B

16.A

17.B

18.A