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Factor them both.

2 x 5 x 7 x 7 = 490

2 x 2 x 2 x 5 x 7 + 280

Find the factors in common.

2 x 5 x 7 = 70, the HCF

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12y ago
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Q: Why is the greatest common factor of 280 and 490 equals 70?
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