28 squared

28² = 28 × 28 = 784

To square a number, multiply it by itself. 28 squared is written 28² or 28^2, and the answer is 784.

How to work out 28 squared

Direct: 28 × 28 = 784.
From the previous square: 27² = 729, and 28² = 729 + (2 × 28 − 1) = 729 + 55 = 784.
Split the number: 28 = 20 + 8, so 28² = 20² + 2 × 20 × 8 + 8² = 400 + 320 + 64 = 784.

Related

28 cubed = 21,952
The square root of 784 is 28, so 784 is a perfect square.

Squares near 28

Number	Squared
24	576
25	625
26	676
27	729
29	841
30	900
31	961
32	1,024

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