# What are perfect cubes and how to explain it?

Did you study cubes topic in mathematics? And do you know what are perfect cubes? This topic has very much importance. In NCERT class 8 mathematics book, if you see one entire chapter is allotted to study about cubes and cube roots. The meaning of cube is three. I think you know how to find the cube of any number. If any number is multiplied thrice then the result will be a cube of that number. As we learnt cube now we will know what are perfect cubes? And its definition.

## Perfect cubes definition:

If “a” is any number and if it is written as b x b x b then “a” said to be a perfect cube.

Example:

The number 216 is a perfect cube because it can be written as 6 x 6 x 6.

1000 is also a perfect cube number as it can be written as 10 x 10 x 10.

64 is not a perfect cube number because it can be written as 8 x 8. Here there are two 8’s only but perfect cube means three 8’s should be there.

I hope you understood what are perfect cubes and how to say that the given number is perfect cube or not. 