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B1. Indices : Cube root. 2 x 2 x 2=8, or 23=8, so 8 is the cube of 2. 2 is the cube root of 8. Similarly, 33=27, so 27 is the cube of 3, and 3 is the cube root of 27. 43=64, so 64 is the cube of 4, and 4 is the cube root of 64. 53=125, so 125 is the cube of 5, and 5 is the cube root of 125. 63=216, so 216 is the cube of 6, and 6 is the cube root of 216. The cube root of a number, n, can also be written as: Practise your cubes. Press the button to get started. you must cube: