ESTIMATE SQUARE ROOTS
About "Estimate square roots"
Estimate square roots :
As soon as we saw a number, we can tell that the square root of the given number lies between these two numbers.
For example square root of the number 40 lies between 6 and 7.
Because square root of 36 is 6 and square root of 49 is 7. The given number lies between 36 and 49. So that we can say that the square root of the given number is between 6 and 7.
Shortcut to find square root
From the above table we come to know that
- (i) If a perfect square has ‘n’ digits where n is even, its square root has n/2 digits.
- (ii) If a perfect square has ‘n’ digits where n is odd, its square root has (n + 1)/2 digits.
Estimate square roots - Examples
Example 1 :
Estimate the value of the following to the nearest whole number.
√80
Solution :
√64 < √80 < √81
8 < √80 < 9
Since the given number lies between 64 and 81, the approximate square root of the given number is 8.
Hence the approximate value of √80 is 8.
Example 2 :
Estimate the value of the following to the nearest whole number.
√1000
Solution :
The given number is greater than 900. If we multiply 32 x 32 we will get 1024 which is greater than 1000. So we have to try the number less than 32 but greater than 30.
31 x 31 = 961 < 1000
Hence the approximate square root of 100 is 31.
Example 3 :
Estimate the value of the following to the nearest whole number.
√172
Solution :
The given number is greater than 169 and lesser than 196. So the square root of the given number lies between 16 and 17.
Hence the approximate square root of 172 is 16.
Example 4 :
Estimate the value of the following to the nearest whole number.
√5928
Solution :
Number of digits in the given number = 4
So, square root of 5928 will have 2 digits.
70 x 70 = 4900
75 x 75 = 5625
77 x 77 = 5929
Hence the approximate square root of 5928 is 76.
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