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23 November 2015

Script for Useful maths tricks for competitive exam

How to find a CUBE ROOT of number

13824
Step 1: Now to find the unit place of the cube root always remember the following points
1.If the Last digit of a cube root is 8 than the unit digit will be 2.
2.If the Last digit of a cube root is 2 than the unit digit will be 8.
3.If the Last digit of a cube root is 3 than the unit digit will be 7.
4.If the Last digit of a cube root is 7 than the unit digit will be 3.
5.If the Last digit of a cube root is other than 2,3,7,8 than put the same number as the unit digit.
Now the unit digit will be 4

Step 2: Now strike the last 3 digits of the given number.
13824
Step 3: Now find the nearest square of the first 2 digit from the left
Now the nearest cube is 8
Step 4now 8 is the cube root of 2
Therefore the ten’s place digit is 2
So the answer will be 24
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