1.

Find out the square root of 1764?1. 322. 423. 224. 525. 12

Answer» Correct Answer - Option 2 : 42

Given:

The given number = 1764

Concept:

Calculation skills trick

Calculation:

Step(1):

The unit digit in this number is 4, which can be a unit digit of its square root number such as 2 or 8. Because 2 x 2 is 4 and 8 x 8 is 64.

Step(2):

Now let us consider the first two digits that is 17 which comes between the squares of 4 and 5 because 16 < 17 < 25

Step(3):

We can assume that the ten’s digit of the square root of 1764 is the lowest among the two numbers i.e. 4

Step(4):

Now, we need to find among 42 and 48 which is the square root of 1764.

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 greater than 17.

Step(6):

Square root of 1764 will be the smaller number among 42 and 48 i.e. 42.

∴ √1764 = 42


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