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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