Correct Answer - Option 3 : 49
Given:
The given number = 2401
Concept:
Calculation skills trick
Calculation:
Step(1):
The unit digit in this number is 1, which can be a unit digit of its square root number such as 1 or 9. Because 1 x 1 is 1 and 9 x 9 is 81.
Step(2):
Now let us consider the first two digits that is 24 which comes between the squares of 4 and 5 because 16 < 24 < 25
Step(3):
We can assume that the ten’s digit of the square root of 2401 is the lowest among the two numbers i.e. 4
Step(4):
Now, we need to find among 41 and 49 which is the square root of 2401.
Step(5):
Since the ten’s digit is 4 and the next number is 5, we need to multiply both the numbers like 4 x 5 = 20 and since 20 is smaller than 24.
Step(6):
Square root of 2401 will be the greater number among 41 and 49 i.e. 49.
∴ √2401 = 49
