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210.

The greatest common factor (or GCF) is defined as the largest number that can be divided into two (or more numbers) and result in an integer answer (no remainder).

To get the GCF, one factors the numbers involved and takes only the factors that both numbers share (the number of times that they are shared).

210 = 2 * 3 * 5 * 7

1260 = 2 * 2 * 3 * 3 * 5 * 7

Factors shared are 2, 3, 5 and 7, so 2*3*5*7 = 210.

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15y ago

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