Well, isn't that just a happy little math problem we have here! The greatest common factor of 21 and 100 is 1. While these numbers don't have any common factors other than 1, remember that every number has 1 and itself as factors, just like every tree has its roots and branches.
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The greatest common factor of 21 and 77 is 7.
The Greatest Common Factor of 21, 9 is 3.
The Greatest Common Factor of 21, 63, 84: 21
The Greatest Common Factor (GCF) of 21 and 98 is 7.
What is the greatest common factor shared by 51 and 21?