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You have to first find all the factors of each number. Then find the greatest one they have in common. Lets do 27 and 81

factors of 27 - 1, 3, 9, 27

factors of 81 - 1, 3, 9, 27, 81

the GCF is 27

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13y ago
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Q: How do you work out greatest common factors?
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