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How many 1 -by-1 -by-1 -inch cubes fit inside of this
rectangular prism?

The number of 1 -by-1 -by-1 -inch cubes that can fit inside of this rectangular prism 120 cubes.
volume = lwh
where
Therefore,
volume = 10 × 3 × 4 = 120 inches³
Volume of the cube = l³
where
Therefore,
volume = 1 × 1 × 1 = 1 inches³
Therefore, the number of 1 -by-1 -by-1 -inch cubes that can fit inside of this rectangular prism is as follows;
number of cube = 120 / 1 = 120 cubes
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