3 x 3 = 9
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It is a square number because 9 times 9 equals 81
The number that equals 9 tens is 90. This is because each ten contributes a value of 10, so 9 times 10 equals 90.
8 times 9 = 72
3 x 3 = 9
9 is already a square number because 3 times 3 equals 9