To calculate the volume of a cube, you use the third power of the length, so for example, if the length of an edge of a cube is 3" then the volume is 3x3x3 = 27 cubic inches. As a result, any time a number is raised to the third power, we can call it cubed, much as raising it to the second power is that number squared.
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It is called a perfect cube.
It is a perfect cube.
It is a perfect cube.
A perfect cube.
It is called a seven cube because each pair of opposite faces adds to seven.