1,3,7, and 21
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The GCF is 3.
The GCF is 7.
The remainder can be anything from zero to 20 ... 21 possibilities.
The Greatest Common Divisor/Denominator is 21
common divisor is 3 and 1 6 divided by 3 = 2 6 divided by 1 = 6 15 divided by 3 = 5 15 divided by 1 = 15 21 divided by 3 = 7 21 divided by 1 = 21