When you're looking for a GCF, you are comparing two numbers. You've given us 21, but what is the other one?
Recall the factors of 21 are
1 & 21
or 3 & 7
Chloe P.
asked • 05/04/16What is the GCF for 21
I am doing a math problem and I want to know fast, what is the greatest common factors for 21?
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