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.
You can use the Mathway widget below to practice Algebra or other math topics. Try the given examples, or type in your own problem. Then click "Answer" to check your answer.
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