| Question का Unit Digit | Answer का Unit Digit |
| अगर 1 होगा | 1 or 9 होगा |
| अगर 4 होगा | 2 or 8 होगा |
| अगर 5 होगा | 5 होगा |
| अगर 6 होगा | 4 or 6 होगा |
| अगर 9 होगा | 3 or 7 होगा |
Example -: 1
Q. √576 = ?
Answer-:
Step-1
Paired the number from right to left:- 576
Here Unit Digit is 6.
Step-2
So Unit digit of the answer is 4 or 6.
Step-3
576-: 5 is in between 2² & 3².
So Tenth Digit of the answer is 2.
Step-4
2(Tenth Digit)×3=6
* 576 Here 5 is smaller than 6 that’s why
unit digit will be 4.
* Final Answer is 24.
Example -: 2
Q. √841= ?
Answer-:
Step-1
Paired the number from right to left:- 841
Here Unit Digit is 1.
Step-2
So Unit digit of the answer is 1 or 9.
Step-3
841-: 8 is in between 2² & 3².
So Tenth Digit of the answer is 2.
Step-4
2(Tenth Digit)×3=6
* 841 Here 8 is greater than 6 that’s why
unit digit will be 9.
* Final Answer is 29.
Example -: 3
Q. √5184= ?
Answer-:
Step-1
Paired the number from right to left:- 884
Here Unit Digit is 4.
Step-2
So Unit digit of the answer is 2 or 8.
Step-3
5184-: 51 is in between 7² & 8².
So Tenth Digit of the answer is 7.
Step-4
7(Tenth Digit)×8=56
* 5184 Here 51 is smaller than 56 that’s why
unit digit will be 2.
* Final Answer is 72.
Example -: 4
Q. √1024= ?
Answer-:
Step-1
Paired the number from right to left:- 1024
Here Unit Digit is 4.
Step-2
So Unit digit of the answer is 2 or 8.
Step-3
1024-: 10 is in between 3² & 4².
So Tenth Digit of the answer is 3.
Step-4
3(Tenth Digit)×4=12
* 1024 Here 10 is smaller than 12 that’s why
unit digit will be 2.
* Final Answer is 32.