How to find the cube root of a number? To Find out cube root is very difficult and complex matter, but here we are sharing some easy tricks to find out a cube root in a very simple way. We see that in the competitive exams like -IBPS PO or IBPS Clerk, a lot of time is being taken to find out the cube root and consume our valuable times.With the help of this trick, we can find out cube root within a second and save our precious time.
How to solve cube root within the second? This trick will help you to save 40 seconds of calculation par question.
#1. REMEMBERING UNIT DIGITS
The first Step you need to remember cubes of 1 to 10 and unit digits of these cubes. The figure below shows the cube in the left and unit digits in the right.
Now, look at the above chart. We have to see the last digit number for cube root. We can definitely see here that,
the last digit number is 9 for cube root of 9.
Similarly, the last digit number is 7 for cube root of 3.
vice versa the last digit number is 6 for cube root of 6.
#2. FOCUS ON CUBE ROOT FROM REMAINING DIGITS
Note that this method works only if the number given is a perfect cube.
Here we give more details to find out the Cubs root
First, we have to focus on last 3 digits and put/mark to find out the cube root thereafter find out the cube root on remaining parts.
Q.Find the cube root of 32768.
Unit digit of 32/768 is 2. So we can say that unit digit of its cube root will be 8.
Now we Find 2
Now we find the cube root of 32 by deriving from remaining digits.
32 is Lying between in this above two number. here we chose a small number which is 3
Now we Find 3
Therefore answer is 32
Q.Find the cube root of 17576
Solution: 17/576 the last digit number is 6 So we can say that unit digit of its cube root will be 6.
Now we find 6
Now we find the cube root of 17 by deriving from remaining digit.
17 is lying between in this above two number. Here we chose a small number which is 2.
Now we find 2.
Therefore answer is 26
Practice this technique to help you in the exams. There is no easier way to find cube root of a number.
Find Cube root - Quiz 1
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Question 1 of 2
Answer: 28 + 33 = 61Incorrect
Answer: 28 + 33 = 61
Question 2 of 2
Answer: 88 – 78 + 49 = 59Incorrect
Answer: 88 – 78 + 49 = 59
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