Square of 10
10 squared equals 100. 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 — 1 here. On the last digit, squares end only in 0, 1, 4, 5, 6 or 9, and 0 fits. Between its neighbors, 81 sits 19 below and 121 sits 21 above — the square ladder widens by exactly two at every step. Double the base and the square quadruples: 20² = 400, which is 4 × 100. 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 |
|---|---|
| 10² | 100 |
Frequently asked questions
What is 10 squared?
10 squared is 100, because 10 × 10 = 100. The exponent 2 is why it is written 10².
What is 11 squared, next to 10²?
11² = 121, which is 21 more than 10² = 100. Each step up adds double the base plus one.
Where do squares show up in real problems?
Area of a square with side 10, distance in the Pythagorean theorem, and variance in statistics all use squared values.