15 squared

15² = 15 × 15 = 225

To square a number, multiply it by itself. 15 squared is written 15² or 15^2, and the answer is 225.

How to work out 15 squared

• Direct: 15 × 15 = 225.
• From the previous square: 14² = 196, and 15² = 196 + (2 × 15 − 1) = 196 + 29 = 225.
• Split the number: 15 = 10 + 5, so 15² = 10² + 2 × 10 × 5 + 5² = 100 + 100 + 25 = 225.

Related

• 15 cubed = 3,375
• The square root of 225 is 15, so 225 is a perfect square.

Squares near 15

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