7, what's the highest number that goes evenly into 63 and 70. There aren't that many... :D
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The GCF of 21, 56, 63, and 84 is 7.
The GCF is 1.
The GCF is 7.
The Greatest Common Factor of 21, 63, 84: 21
Greatest common factor for 35 and 63 and 84 is 7.