Question

how many one inches cubes are needed to create a cube with a side lenght of 7 inches

Answer 1

343 cubes are needed

Answer 2

volume of cube = a³
volume of cube having side 7 inch  = 7³ = 343 cu.inch
volume of cube having side  1 inch = 1³ = 1 cu.inch
no.of 1 inch sided cubes required to make a  cube of 7 inch cube
= 343/1
= 343 cubes