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When you need to reduce fractions.
When you need to reduce fractions to their simplest form.
You need at least two numbers to find a GCF.
You need to have a unicorn
To find the greatest common factor of two numbers, you first need to factorise those numbers. In this case: 72=3x3x2x2x2 91=7x13 The next step would be to find any common factors. As there are none, this means that the greatest common factor of 72 and 91 is 1.