Question

# The common factors 9 and 21 are________________

- 9 and 3
- 1 and 3
- 4 and 3
- 1 and 9

Hint:

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

389848

389848 |

## The correct answer is: 1 and 3

### First, find the factors of 9 and 12.

9 = 1, 3, 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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