The Greatest Common Factor (GCF) of 40 and 2 is 2.
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The GCF of 20 and 22 is 2. This gives you 10 and 11 respective remainders from division. You cannot get any further common factors.
The GCF of these numbers is 40.
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22 is the GCF of 66 and 22.
The GCF is 11.
21 and 42 have a GCF of 21. 40 and 80 have a GCF of 40. The GCF of 21 and 40 is 1.