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The greatest common factor of 20 and 45 is 5.

The factors of 20 are: 1, 2, 4, 5, 10, 20

The factors of 45 are: 1, 3, 5, 9, 15, 45

The common factors are: 1, 5

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Wiki User

8y ago
This answer is:
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Anonymous

Lvl 1
4y ago
Thank you this was very helpful!

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Q: What is the greatest common factor of 20 and 45?
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