Today I will be sharing the trick to find the Cube Root of any number (perfect Cubes only) without the
need of any calculator. But before that just learn this table as you will need it to find the Cube Root.
Example 1
Suppose we want to find the cube root of 21952.
Step 1: Ignore last three digits of 21952. Remaining number left is ’21′.
Step 2: From the above table cube of ’2′ is less than ’21′. Therefore left part (L) of our answer will be ’2′.
Step 3: Since last digit of ‘21952‘ is ‘2‘. Therefore right part (R) of our answer will be ’8′. (Because Last
digit of ‘cube of 8′ is 2. see table above.)
Step 4: Our Answer will be LR. Therefore Answer will be 28 = 28.
need of any calculator. But before that just learn this table as you will need it to find the Cube Root.
Number

Cube Last

Digit of Cube

0

0

0

1

1

1

2

8

8

3

27

7

4

64

4

5

125

5

6

216

6

7

343

3

8

512

2

9

729

9

Trick Used:
We will follow these steps to find the cube root of a number:
1. Ignore the last 3 digits of the number. Let remaining number be “I”.
2. From the above table check which number’s cube is less than or equal to ‘I’. It will be left part of our
answer. Let it be “L”.
3. Let Right part of our answer be “R”. It will be determined from the above table. For Ex. If last digit of
question is 7, then last digit of our answer will be 3.
We will follow these steps to find the cube root of a number:
1. Ignore the last 3 digits of the number. Let remaining number be “I”.
2. From the above table check which number’s cube is less than or equal to ‘I’. It will be left part of our
answer. Let it be “L”.
3. Let Right part of our answer be “R”. It will be determined from the above table. For Ex. If last digit of
question is 7, then last digit of our answer will be 3.
4. Our answer will be LR.
Example 1
Suppose we want to find the cube root of 21952.
Step 1: Ignore last three digits of 21
Step 2: From the above table cube of ’2′ is less than ’21′. Therefore left part (L) of our answer will be ’2′.
Step 3: Since last digit of ‘21952‘ is ‘2‘. Therefore right part (R) of our answer will be ’8′. (Because Last
digit of ‘cube of 8′ is 2. see table above.)
Step 4: Our Answer will be LR. Therefore Answer will be 28 = 28.