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Square numbers up to 25 × 25
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Learn it A square number is a number times itself: $n^2 = n \times n$. It is the area of a square with side n.
Example: Find $15^2$ and $21^2$.
- $15^2 = 15 \times 15 = 225$.
- $21^2 = 21 \times 21 = 20 \times 21 + 21 = 420 + 21 = 441$.
- Learn the squares to $25^2 = 625$ by heart.
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