What is the Greatest Common Factor of 6 and 21?

Greatest Common Factor of 6 and 21

Here we will first tell you what the Greatest Common Factor of 6 and 21 is and then show you how we found the Greatest Common Factor of 6 and 21.

The Greatest Common Factor of 6 and 21 is:

3

Step-by-step instructions for how to find the Greatest Common Factor of 6 and 21:

Step 1) We made a list of all the factors of 6 which are 1, 2, 3, 6.

Step 2) Then, we made a list of all the factors of 21 which are 1, 3, 7, 21.

Step 3) Finally, we compared the lists in Step 1 and Step 2 to find that the largest number they have in common is 3. That means that the Greatest Common Factor of 6 and 21 is 3.

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