123 squared

123² = 123 × 123 = 15,129

To square a number, multiply it by itself. 123 squared is written 123² or 123^2, and the answer is 15,129.

How to work out 123 squared

• Direct: 123 × 123 = 15,129.
• From the previous square: 122² = 14,884, and 123² = 14,884 + (2 × 123 − 1) = 14,884 + 245 = 15,129.
• Split the number: 123 = 120 + 3, so 123² = 120² + 2 × 120 × 3 + 3² = 14,400 + 720 + 9 = 15,129.

Related

• 123 cubed = 1,860,867
• The square root of 15,129 is 123, so 15,129 is a perfect square.

Squares near 123

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