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You can't. You need at least two numbers to find a GCF.

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8y ago
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Wiki User

11y ago

Factor them.

2 x 2 x 2 x 5 = 40

2 x 5 x 7 = 70

Select the common factors.

2 x 5 = 10, the GCF

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Wiki User

9y ago

3 x 7 = 21

2 x 5 x 7 = 70

The GCF is 7.

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9y ago

2 x 2 x 2 x 5 = 40

2 x 5 x 7 = 70

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9y ago

The GCF is 8.

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Q: How can you find the greastest common factor of 70?
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