The same as the GCF of 28 and 7 (7 is the remainder when you divde 63 by 28).
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The GCF is 3.
You need at least two numbers to find a GCF.
63 is 225% of 28. 28 is 44.4% of 63.
63 is 225% of 28. 28 is 44.4% of 63.
28/63 = 4/9 28/7=4 63/7=9