That would be 15, otherwise known as the "square root" of 225
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Another way to ask this question is, what is the square root of 225? A square root is a number that, when you multiply it by itself, you get the number you started with. For instance, the square root of 4 is 2, because 2x2=4. The square root of 9 is 3, because 3x3=9. We could just keep going and try multiplying different numbers by themselves to see if we get 225, and if you do that, you'd find that 15x15=225. Therefore, the square root of 225 is 15.