Square of 25
25 squared equals 625. 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 — 4 here. On the last digit, squares end only in 0, 1, 4, 5, 6 or 9, and 5 fits. Between its neighbors, 576 sits 49 below and 676 sits 51 above — the square ladder widens by exactly two at every step. An odd base keeps the square odd: 625 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 |
|---|---|
| 25² | 625 |
Frequently asked questions
What is 25 squared?
25 squared is 625, because 25 × 25 = 625. The exponent 2 is why it is written 25².
What is 26 squared, next to 25²?
26² = 676, which is 51 more than 25² = 625. Each step up adds double the base plus one.
Where do squares show up in real problems?
Area of a square with side 25, distance in the Pythagorean theorem, and variance in statistics all use squared values.