40 squared

40² = 40 × 40 = 1,600

To square a number, multiply it by itself. 40 squared is written 40² or 40^2, and the answer is 1,600.

How to work out 40 squared

Direct: 40 × 40 = 1,600.
From the previous square: 39² = 1,521, and 40² = 1,521 + (2 × 40 − 1) = 1,521 + 79 = 1,600.

Related

40 cubed = 64,000
The square root of 1,600 is 40, so 1,600 is a perfect square.

Squares near 40

Number	Squared
36	1,296
37	1,369
38	1,444
39	1,521
41	1,681
42	1,764
43	1,849
44	1,936

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