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Take the number 9 and figure out what whole numbers you could multiply together to get that answer. Exclude the numbers and 9. Now take the number 12 and figure out what whole numbers you could multiply to get it. Exclude 1 and 12.

When you're all done, look at them to see what number they have in common. That will be your common factor!

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msoexpert

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4y ago
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Wiki User

12y ago

The greatest common factor of 9 and 12 is 3.

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Wiki User

7y ago

Factors of 9: 1, 3, 9

Factors of 12: 1, 2, 3, 4, 6, 12

Common Factors: 1, 3
3

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Anonymous

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4y ago

Jim

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Q: Common factor of 9 and 12?
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