# Math 数学计算

- [69. Sqrt(x)](/lcbook/math/sqrt.md)
- [Ugly Number](/lcbook/math/ugly-number.md)
- [263. Ugly Number](/lcbook/math/ugly-number/263.-ugly-number.md)
- [264. Ugly Number II](/lcbook/math/ugly-number/264.-ugly-number-ii.md)
- [202. Happy Number](/lcbook/math/202.-happy-number.md)
- [441. Arranging Coins](/lcbook/math/441.-arranging-coins.md)
- [447. Number of Boomerangs](/lcbook/math/447.-number-of-boomerangs.md)