Mental Math: Finding Square Roots to 1 Decimal Point
I have 2 questions here.
What is the most effective and easy way of calculating square roots in
your head to an accuracy of 1 decimal point? This would need to work with
at least two digit, non-perfect squares and would have to be doable
mentally.
How would the method work?
Is one decimal place accurate enough for all intents and purposes that you
may come across in average math? When would you need more precision?
I am curious because often times in school, I would spend time with paper
and pencil, working out approximations for non-perfect squares, it would
help if I could get an approximation quicker.
Thanks!
Edit: Please ensure that the method is easy to understand, and to do
mentally for a student in grades 8 and above. I don't want to be just
memorizing formulas without understanding how they work, I think it would
be beneficial for anyone browsing this question.
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