Olympiad – Class VI – Mathematics - Playing with Numbers

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Question - 1

What are the numbers which have more than two factors called?

  • A Even numbers
  • B Prime numbers
  • C Composite numbers
  • D Odd numbers

Question - 2

What are the numbers which have only two factors (1 and the number itself) called?

  • A Composite numbers
  • B Even numbers
  • C Prime numbers
  • D Odd numbers

Question - 3

Which is the number that is neither prime nor composite?

  • A 0
  • B 1
  • C 2
  • D 5

Question - 4

Which of the following is the L.C.M.of 36 and 72?

  • A 36
  • B 72
  • C 108
  • D 2

Question - 5

What is the L.C.M.of 17 and 5 ?

  • A 105
  • B 95
  • C 85
  • D 5

Question - 6

What is the H.C.F.of 17 and 5 ?

  • A 1
  • B 5
  • C 17
  • D 85

Question - 7

Give an example for twin primes.

  • A 5,11
  • B 3,5
  • C 11, 17
  • D 3,7

Question - 8

What is the H.C.F. of two co-prime numbers?

  • A 1
  • B 0
  • C 2
  • D 4

Question - 9

Which of the following is an example of an even number?

  • A 10351
  • B 20989
  • C 69007
  • D 973572

Question - 10

What is the H.C.F.of 120, 144 and 216 ?

  • A 38
  • B 24
  • C 120
  • D 144
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