When something is cubed it is written as:
X3
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-2.56 times 10 cubed in standard form is -2.56 x 103
729
4 cubed is 43 2 cubed is 23 etc
15 cubed (or 153) in standard form is 15 x 15 x 15 which equates to 3,375.
6 cubed is equal to 216.