129 squared

129² = 129 × 129 = 16,641

To square a number, multiply it by itself. 129 squared is written 129² or 129^2, and the answer is 16,641.

How to work out 129 squared

• Direct: 129 × 129 = 16,641.
• From the previous square: 128² = 16,384, and 129² = 16,384 + (2 × 129 − 1) = 16,384 + 257 = 16,641.
• Split the number: 129 = 120 + 9, so 129² = 120² + 2 × 120 × 9 + 9² = 14,400 + 2,160 + 81 = 16,641.

Related

• 129 cubed = 2,146,689
• The square root of 16,641 is 129, so 16,641 is a perfect square.

Squares near 129

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