Tamil Nadu Board of Secondary EducationSSLC (English Medium) (5 to 8) Class 8

Estimating Square Root

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Notes

Estimating Square Root:

We know that

100 < 250 < 400 and √100 = 10 and √400 = 20.

So, 10 < √250 < 20

But still, we are not very close to the square number.

We know that 152 = 225 and 162 = 256

Therefore, 15 < √250 < 16 and 256 is much closer to 250 than 225.

So, √250 is approximately 16.

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