### Instruction: The square of 15 is 225. The square of what other number is 225?### Response: I know that the square of a number means multiplying the number by itself.
So, 15 * 15 = 225.
I also know that the square of a negative number is positive, because multiplying two negatives gives a positive.
So, (-15) * (-15) = 225 as well.
Therefore, there are two numbers whose square is 225: 15 and -15.