1. Prime factorization of each term, then compare to get the common factors and form the GCF from them.
2. Use an educated 'guess and check' method knowing the multiplication facts (mult. tables)
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Different math questions require different methods to solve.
If you want the "greatest", then there can only be one of it.You can't have two different numbers and say that they'reboth the "greatest".The greatest common factor of 12 and 21 is 3 .
The GCF is: 2The GCF is 2.
The GCF is: 1