Quantitative Aptitude – Cube and Cube Root
Cube and Cube root, these are the basics of any mathematical calculations. In quantitative aptitude you will need cube and cube root in many calculations. So you must do this chapter very carefully.
If you remember, you do this thing in your school days. Its not so hard to learn. You just need to know the rules of How to find out Cube and Cube roots. In exam you may get questions directly from cube and cube root chapter, but you will surely get a question which is related with cube and cube root.
Now we will discuss Cube and Cube root in details.
What is Cube ?
A cube is a nothing but multiply a number with the same number by three times. Say, we need to find the cube of number 4. So we have to multiply the number 4 with 4 by three times.
- 4 x 4 x 4 = 64
We denote a cube as X3. A small 3 is written at the upper right corner of that number. Few other cubes are :
- 2 x 2 x 2 =8
- 3 x 3 x 3 =27
- 4 x 4 x 4 =64
- 5 x 5 x 5 =125 …
What is Cube Root ?
Finding Cube root is the opposite of finding Cube. Its the exact reverse process of finding Cube. Cube root is denoted as 
. Here X is any number.
For example, Cube root of 64 is 4. because we know that Cube of 4 is 64.
Students should memorize cubes upto 10. This would help you to do your cube root problems quickly. Sometimes you may get a question where the cube root be in fractional number. Those are also done in the similar way as you do in normal cube root problems.
For example, What is the Cube root of 66. The answer is 4.04124. The smaller but nearest exact cube root of 66 is 64. cube root of 64 is 4. Now the rest 2 will be calculated as same way and you will get an answer of 04124.
If you need any farther help on fractional cube root, then let us know. We will discuss on those problems here in www.AptitudeTricks.com.