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The GCF of 18 and 42 is 6. 6 goes into 18 3 times and into 42 7 times

To find the GCF, you can list the factors of each number:

The factors of 18 are 1, 2, 3, 6, 9, and 18

The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 48

The greatest factor they have in common is 6, so 6 is the GCF.
The GCF is 6.

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7y ago

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