HOW TO SOLVE CUBE ROOT PROBLEM EASILY

 || HOW TO SOLVE CUBE ROOT PROBLEM EASILY || 

NO CALCULATOR

 

DISCUSSION:

LET'S START:

1.  What is the root cube of "157464" ?

Answer : 54 

How?

Last digit of this number is = ........4, So, TAKE  4

Now, ignore last 3 number 157 4 6 4  =  54

[216 (6) is bigger than 157, so we will take root cube of 125 (5) is 5]  

2.  What is the root cube of "438976" ?

Answer: 76 (How?)

Step-1:

Last digit of this number is = ........6, So, TAKE  6

Step-2:

Now, ignore last 3 number 438 9 7 6   =  7 6   

 [512 (8) is bigger than 438. So, we will take root cube of 343 (7) is 7]  

[Same method if the last digit is 0, 1, 4, 5, 6, 9]

Try to solve: 

What is the root cube of "343000"? 

What is the root cube of "857375"? 

What is the root cube of "531441"? 

What is the root cube of "205379"? 

What is the root cube of "830584"? 

What is the root cube of "287496"? 

HAVE YOU NOTICED???!!!!

I didn't put any number containing last digit 2,3,7 and 8 

Because 

1. We have to take 7 if the last digit is 3 and vice-versa (3 for 7)

2. We have to take 8 if the last digit is 2 and vice-versa (8 for 2)

WHY?

Now, We can try to solve

What is the root cube of "912673"?

Step-1:

Take the last digit = 7 (for 3- as described above)

Step-2:

Ignore last 3 digit of the given number = 912...

Step-3: 

912 is greater than 729 (9) and less than 1000 (10)

We will take 9. 

Answer: 97

Now you can solve any math root cube from (1-100)

Do yourself:

1. What is the root cube of "35937"?

2. What is the root cube of "91125"?

3. What is the root cube of "531441"?

4. What is the root cube of "778688"?

5. What is the root cube of "85184"?

6. What is the root cube of "438976"?

7. What is the root cube of "50653"?

8. What is the root cube of "195112"?

9. What is the root cube of "328509"?