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The greatest common factor (GCF) is the largest factor that two or more numbers have in common. You find the GCF by listing the prime factors of each number. Find the prime factors the numbers have in common and multiply them.
154: 2 x 7 x 11
42: 2 x 3 x 7
The factors they have in common are: 2 x 7
GCF = 14
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