Mathematics
Grade-4-
Easy

Question

The common factors 9 and 21 are________________

  1. 9 and 3
  2. 1 and 3
  3. 4 and 3
  4. 1 and 9

hintHint:

First, find all the factors of 9 and 12. Then find the common factors.
389848

The correct answer is: 1 and 3


    First, find the factors of 9 and 12.
    9 = 13, 9
    12 = 1, 2, 3, 4, 6, 12
    The common factors are 1 and 3.
    The correct option (b) 1 and 3

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