Greatest Common Divisor

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Find the *Greatest Common Divisor* (GCD) of the numbers 3240 and 28.

**Answer**

$3240=({2}^{3})({3}^{4})(5)$

$28=({2}^{2})(7)$

The GCD of 3240 and 28 is the product of the least powers of each prime factor in both.

Thus the GCD of 3240 and 28

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

$=4$