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To find the greatest common factor (GCF), first find the prime factorization of the two numbers.

The GCF is the product of all of the prime factors the two numbers have in common.

If two numbers have no common factors, the GCF is 1. (Since all numbers are divisible by 1.)

Prime factors of 545: 5, 109

Prime factors of 1024: 2, 2, 2, 2, 2, 2, 2, 2, 2, 2

They have in common: Nothing.

The GCF is 1.

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15y ago

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