Videos, worksheets, stories and songs to help Grade 8 students learn about perfect cubes and cube roots.
In this lesson, we will learn what are perfect cubes and how to calculate the cube root of a perfect cube.
A perfect cube is a number that is the cube of an integer.
For example, 125 is a perfect cube since 125 = 5 × 5 × 5= 53
Some examples of perfect cubes are 1, 8, 27, 64, 125, 216, 343, ..
The opposite of cubing a number is finding the cube root. Since 53 = 125, the cube root of 125 is 5. The cube root of a perfect cube is an integer.
It is possible to get the cube root of a negative number. For example, the cube root of −125 is −5.