well first of all your an idiot. you write it with a little three over on the right of the 2.
23
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Unfortunately, superscripts and subscripts are not recognized in WikiAnswers. 2 cubed would be written with a superscript 3 following a 2. To indicate that here, we write 2^3.
4 cubed is 43 2 cubed is 23 etc
729
13 cubed is 13 x 13 x13 or 13^3 and equal to 2,197.
In mathematical notation, a number cubed is written as x3. For 15 cubed, that would be 153 or (15 X 15 X 15 =) 3,375