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How do you use factor trees to find the greatest common factor of 12 and 42?
Wiki User
∙ 14y ago
Here are factor trees for 12 and 42:
12 - 2
- 6 - 2
- 3
42 - 2
- 21 - 3
- 7
The leaves in 12's factor tree are: 2, 2, and 3.
The leaves in 42's factor tree are: 2, 3, and 7.
The longest common sub-sequence of the leaf lists is: 2, 3.
Therefore, multiply 2 by 3 and we get that 6 is the gcf of 12 and 42.
Wiki User
∙ 14y ago
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