Edward Brooks - Mental arithmetic - 1873 - 188 pages
...power, etc. 27. What is the square, cube, and fourth power of 1 ? 2? 3? 4? 5? 6? 7? 8? 9? 10? 11? 12? The square root of a number is one of the two equal factors of that number ; the cube root, one of the three equal factors ; the fourth root, one of the four equal...