9 squared

9² = 9 × 9 = 81

To square a number, multiply it by itself. 9 squared is written 9² or 9^2, and the answer is 81.

How to work out 9 squared

Direct: 9 × 9 = 81.
From the previous square: 8² = 64, and 9² = 64 + (2 × 9 − 1) = 64 + 17 = 81.

Related

9 cubed = 729
The square root of 81 is 9, so 81 is a perfect square.

Squares near 9

Number	Squared
5	25
6	36
7	49
8	64
10	100
11	121
12	144
13	169

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