Edit Article How to Calculate Cube Root by Hand With the use of calculators, finding the cube root of any number may be just buttons away. But perhaps you don’t have a calculator, or you want to impress your friends with the ability to calculate a cube root by hand.
There is speedcubing store that appears a bit laborious at first, but with practice it works fairly easily. It is helpful if you remember some basic math skills and some algebra about cube numbers. Steps Part Working Through a Sample Cube Root Problem Set up the problem. Solving the cube root of a number is going to look like solving a long division problem, with a few special differences. The first step is to set up the problem in the proper format. Write down the number whose cube root you want to find.
Write the digits in groups of three, using the decimal point as your starting place. For this example, you will find the cube root of . Write this as . . Select a number that, when cubed, gives the largest possible result less than the first set of three numbers. In this example, the first set of three numbers is . Find the largest perfect cube that is less than . That number is , and its cube root is . Write the number above the radical bar line, over the number .
Write the value of displaystyle ^ , which is , underneath the number , draw a line and subtract, just as you would in long division.