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The GCF of 42 and 70 is 14.

42 = 2 x 3 x 7

70 = 2 x 5 x 7

Common factors 2 and 7 = 14

Another method: 70 / 42 = 1 r 28

42 / 28 = 1 r 14

28 / 14 = 2 r 0

So The Greatest Common Factor for 42 and 70 is 14.
The GCF is 14.

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Q: What is the greatest common factor of 42 and 70?
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