Correct Answer - Option 3 : 76
Given:
The given number = 5776
Concept:
Calculation skills trick
Calculation:
Step(1):
The unit digit in this number is 6, which can be a unit digit of its square root number such as 4 or 6. Because 4 x 4 is 16 and 6 x 6 is 36.
Step(2):
Now let us consider the first two digits that is 57 which comes between the squares of 7 and 8 because 49 < 57 < 64
Step(3):
We can assume that the ten’s digit of the square root of 5776 is the lowest among the two numbers i.e. 7
Step(4):
Now, we need to find among 74 and 76 which is the square root of 5776.
Step(5):
Since the ten’s digit is 7 and the next number is 8, we need to multiply both the numbers like 7 x 8 = 56 and since 56 is less than 57.
Step(6):
Square root of 5776 will be the greater number among 74 and 76 i.e. 76.
∴ √5776 = 76
