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Answers − Common Factors

1.  What are the common factors of 14 and 28?
  The factors of 14 are 1, 2, 7 and 14
  The factors of 28 are 1, 2, 4, 7, 14 and 28
  So the common factors 14 and 28 are 1, 2, 7 and 14

2.  What are the common factors of 16 and 32?
  The factors of 16 are 1, 2, 4, 8 and 16
  The factors of 32 are 1, 2, 4, 8, 16 and 32
  So the common factors of 16 and 32 are 1, 2, 4, 8 and 16

3.  What are the common factors of 18 and 40?
  The factors of 18 are 1, 2, 3, 6, 9 and 18
  The factors of 40 are 1, 2, 4, 5, 8, 10, 20 and 40
  So the common factors of 18 and 40 are 1 and 2

4.  What are the common factors of 8 and 24?
  The factors of 8 are 1, 2, 4 and 8
  The factors of 24 are 1, 2, 3, 4, 6, 8, 12 and 24
  So the common factors of 8 and 24 are 1, 2, 4 and 8

5.  What are the common factors of 15 and 18?
  The factors of 15 are 1, 3, 5 and 15
  The factors of 18 are 1, 2, 3, 6, 9 and 18
  So the common factors of 15 and 18 are 1 and 3

6.  What are the common factors of 20 and 32?
  The factors of 20 are 1, 2, 4, 5, 10 and 20
  The factors of 32 are 1, 2, 4, 8, 16 and 32
  So the common factors of 20 and 32 are 1, 2 and 4

7.  What are the common factors of 18 and 30?
  The factors of 18 are 1, 2, 3, 6, 9 and 18
  The factors of 30 are 1, 2, 3, 5, 6 , 10, 15 and 30
  So the common factors of 18 and 30 are 1, 2, 3 and 6

8.  What are the common factors of 15, 24 and 30?
  The factors of 15 are 1, 3, 5 and 15
  The factors of 24 are 1, 2, 3, 4, 6, 8, 12 and 24
  The factors of 30 are 1, 2, 3, 5, 6, 10, 15 and 30
  So the common factors of 15, 24 and 30 are 1 and 3

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