Greatest Common Divisor

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Find the *Greatest Common Divisor* (GCD) of the numbers 15 and 270.

**Answer**

$15=(3)(5)$

$270=(2)({3}^{3})(5)$

The GCD of 15 and 270 is the product of the least powers of each prime factor in both.

Thus the GCD of 15 and 270

$=(3)(5)$

$=15$