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Best Answer

2 x 3 x 7 = 42

3 x 3 x 7 = 63

3 x 7 = 21, the GCF

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βˆ™ 10y ago
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βˆ™ 9y ago

With great difficulty. You need at least two numbers to find a GCF.

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βˆ™ 10y ago

It is: 7

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Q: How do you work out the hcf of 63?
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