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The GCF is 6.

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

The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30.

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

The common factors of 18, 30, and 42 ... the numbers that appear on all three lists ...

are 1, 2, 3, and 6.

The greatest one of them is 6 .

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8y ago

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