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Greatest common factor

Grade 5 math · Fieldbook Learning

Name ______________________ Date __________

The greatest common factor is what you divide by to simplify a fraction.

What is the greatest common factor of 6 and 12?
What is the greatest common factor of 15 and 12?
What is the greatest common factor of 4 and 14?
What is the greatest common factor of 18 and 9?
What is the greatest common factor of 15 and 9?
What is the greatest common factor of 10 and 12?
What is the greatest common factor of 5 and 20?
What is the greatest common factor of 33 and 39?
What is the greatest common factor of 27 and 18?
What is the greatest common factor of 15 and 21?
What is the greatest common factor of 32 and 10?
What is the greatest common factor of 10 and 18?
What is the greatest common factor of 34 and 20?
What is the greatest common factor of 16 and 32?
What is the greatest common factor of 57 and 63?
What is the greatest common factor of 63 and 12?
What is the greatest common factor of 63 and 15?
What is the greatest common factor of 66 and 32?
What is the greatest common factor of 54 and 72?
What is the greatest common factor of 75 and 30?

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Answer key: Greatest common factor

6
3
2
9
3
2
5
3
9
3
2
2
2
16
3
3
3
2
18
15