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To find squre root you can first take L.C.M then make a pair of 2-2 and multiply it you will find the answer
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yes, use your calculator. 50 years ago I learned to compute square roots with pencil and paper, a process just a little harder than long division. the pencil and paper process for cube roots is much harder. in general we'd use log tables for roots other than square. but the electronic calculator replaced all that.

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