Olympiad Mathematics class 6th – Playing with Numbers

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Olympiad Mathematics class 6th   Playing with Numbers
I.M.O.  By Suraj Sir
Accent Coaching Institute Hisar

1. The two numbers which have only 1 as their common factor are called __________
   a) Co-primes
   b) Twin Primes
   c) Composite
   d) Even numbers
2. 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
3. The number 3 , 116 , 365 is divisible by…………
   a) 5
   b) 7
   c) Both 5 & 7
   d) None of these
4. 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
5. Which of the following numbers is a perfect square?
   a) 36
   b) 81
   c) 37
   d) Both (A) and (B)
6. 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
7. 1265 is divisible by …………
   a) 2
   b) 3
   c) 10
   d) 11
8. 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
9. 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
10. The number (9,8) are ______ numbers.
    a) Co-prime
    b) Prime
    c) Both prime and co-prime
    d) None of these
11. 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
12. 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
13. 700608000 + 109003 is divisible by __________
    a) 7
    b) 3
    c) 9
    d) 11
14. 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
15. The two consecutive prime number with difference 2 are called ____________
    a) co-prime
    b) Twin prime
    c) composite
    d) Even
16. 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
17. The number which are not multiples of 2 are called ________ numbers.
    a) Even
    b) odd
    c) Prime
    d) Composite
18. 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