<P> The second step is to determine the first digit of the two digit cube root by looking at the magnitude of the given cube . To do this, remove the last three digits of the given cube (29791 → 29) and find the greatest cube it is greater than (this is where knowing the cubes of numbers 1 - 10 is needed). Here, 29 is greater than 1 cubed, greater than 2 cubed, greater than 3 cubed, but not greater than 4 cubed . The greatest cube it is greater than is 3, so the first digit of the two digit cube must be 3 . </P> <P> Therefore, the cube root of 29791 is 31 . </P> <P> Another example: </P> <Ul> <Li> Find the cube root of 456533 . </Li> <Li> The cube root ends in 7 . </Li> <Li> After the last three digits are taken away, 456 remains . </Li> <Li> 456 is greater than all the cubes up to 7 cubed . </Li> <Li> The first digit of the cube root is 7 . </Li> <Li> The cube root of 456533 is 77 . </Li> </Ul>

When 10 is added to the product of 5 and a number the result is 50. what is the number