Square of 5
5 squared equals 25. Squares appear in area calculations, the Pythagorean theorem, and statistics (variance uses squared distances).
Squares obey quiet rules. Divided by 9, a square only ever leaves 0, 1, 4 or 7 — 7 here. On the last digit, squares end only in 0, 1, 4, 5, 6 or 9, and 5 fits. Between its neighbors, 16 sits 9 below and 36 sits 11 above — the square ladder widens by exactly two at every step. An odd base keeps the square odd: 25 ends in an odd digit, as every odd square must. Two anchors most worth memorizing in this range are 12² = 144 and 15² = 225 — the odd-step rule above is why knowing them pays off, because from any anchor the next square is one step along this page's ladder.
| Expression | Value |
|---|---|
| 5² | 25 |
Frequently asked questions
What is 5 squared?
5 squared is 25, because 5 × 5 = 25. The exponent 2 is why it is written 5².
What is 6 squared, next to 5²?
6² = 36, which is 11 more than 5² = 25. Each step up adds double the base plus one.
Where do squares show up in real problems?
Area of a square with side 5, distance in the Pythagorean theorem, and variance in statistics all use squared values.