the GCF 28 and 42

please list all the factors until the last one possible.
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1 Answer

28 = 2 * 2 * 7

42 = 2 * 3 * 7

For the GCF we want a list of the prime factors that appear in both numbers.

For 28 and 42 that's 2 * 7 because 28 and 42 both have a 2 and a 7 inside.

2 * 7 = 14

Answer:  The GCF of 28 and 42 is 14.
by Level 13 User (103k points)

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