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Anonymous
1. (28 = 2 x 2 x 7, 45 = 3 x 3 x 5)
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The GCF is 45.
Their gcf is 15 .
The GCF is 3.
The same as the GCF of 28 and 7 (7 is the remainder when you divde 63 by 28).
You need at least two numbers to find a GCF.