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There are many ways to do it. Have a look at the Wikipedia article (check the link).

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Q: How do you compute square roots mentally?
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Related questions

How would you mentally compute irrational numbers?

Usually with great difficulty. The answer also depends on the nature of the irrational number - whether it is simply a square root or if it is a combination of roots of different orders.


How do you compute square root of 2 manually?

See the related link for a detailed description of a manual method for calculating square roots.


Are compatible numbers difficult to compute mentally?

No.


Why do you say approximate rather than compute for square roots?

Because many square roots are irrational numbers that can not be computed to an exact value for lack of space to continue an infinite string of digits after the decimal point.


How do you compute a square root?

Square roots are computed using the Babylonian method, calculators, Newton's method, or the Rough estimation method. * * * * * Or the Newton-Raphson method.


Why do you say approximate rather than compute when finding square roots when using a calculator or spreadsheet?

Well, it's both: you're using a machine to compute an approximation. Why isn't it exact? Most square roots (such as the square root of two) are irrational numbers, so their decimal representation requires an infinite number of digits. We humans have to have finite answers, hence we round off.


What Numbers that are easy to compute with mentally are called?

benchmark numbers


What can you use to estimate quotients when they are easy to compute mentally?

Your brain, of course.


Are numbers that are easy to compute mentally?

It depends on your computational skills.


How do you compute 4x27x25 mentally?

if you mean multiplication then 4x25=100 x 27 = 270


What term describes Numbers that are easy to compute mentally?

compatible numbers


What are the patterns and properties to compute mentally for 120 times 30?

The patterns and properties to compute mentally 120 times 30 is the numbers 12 and 3 plus the two 0. Multiply 12 by 3 (36) and add the two 0 (3600).