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To find the GCF of two or more numbers, you can list the factor pairs of all the numbers and then look for the largest factor that is common to all the numbers.

42:

1 x 42

2 x 21

3 x 14

6 x 7

30:

1 x 30

2 x 15

5 x 6

54:

1 x 54

2 x 27

3 x 18

6 x 9

6 is the GCF of 42, 30, and 54.

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11y ago

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