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What are the greatest common factor of 105 and 63?

Updated: 8/21/2019
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8y ago

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There is neither a greatest common factor nor common factors of a single number, such as 105, because there cannot be any form of common factor without two or more numbers to compare. Common factors are factors that the numbers being compared have in common. The greatest common factor is the largest factor that all the numbers being compared have in common. Thus, since there are not two or more numbers to compare, there are neither common factors nor a greatest common factor.

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15y ago
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14y ago

45 = 3 x 3 x 5; 105 = 3 x 5 x 7. Common factors 3 x 5 so HCF = 15.

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8y ago

The GCF is 21.

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