18 squared

18² = 18 × 18 = 324

To square a number, multiply it by itself. 18 squared is written 18² or 18^2, and the answer is 324.

How to work out 18 squared

Direct: 18 × 18 = 324.
From the previous square: 17² = 289, and 18² = 289 + (2 × 18 − 1) = 289 + 35 = 324.
Split the number: 18 = 10 + 8, so 18² = 10² + 2 × 10 × 8 + 8² = 100 + 160 + 64 = 324.

Related

18 cubed = 5,832
The square root of 324 is 18, so 324 is a perfect square.

Squares near 18

Number	Squared
14	196
15	225
16	256
17	289
19	361
20	400
21	441
22	484

Need another number? Use the exponent calculator or see all squares and cubes.