The factors of 21 are:
1, 3, 7, 21
The factors of 51 are:
1, 3, 17, 51
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21 - 1, 3, 7, 21 51 - 1, 3, 17 ,51 the GCF is 3
The factors of the two numbers are :- 51 : 1, 3, 17 and 51 21 : 1, 3, 7 and 21. Ignoring the trivial factor of 1, the only common factor and therefore the greatest common factor is 3.
The GCF is 1.
The GCF is 3.
21 - 72 = -51