Greatest Common Divisor

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Find the *Greatest Common Divisor* (GCD) of the numbers 9 and 280.

**Answer**

$9=({3}^{2})$

$280=({2}^{3})(5)(7)$

The GCD of 9 and 280 is the product of the least powers of each prime factor in both.

Thus the GCD of 9 and 280

$=1$