10 + 5
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Addition is the opposite of subtraction. For example, 24 - 9 = 15. If you want to check your answer, add 9 + 15. It equals 24, so your answer is correct.
15 to the 2nd power or 15 squared equals 15 * 15 which equals 225.
15+20
8 and 7 6 and 9 10 and 5
15 times 15 equals 225.