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you need to be really good at your tables if you know how to square numbers (e.g 3 squared is 9 = 3x3= 9 ) then just do the opposite of that (the square root of 9=3 because you need to think what goes into this number by itself ) so technically it's just the opposite of squaring things

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Q: How do you calculate the square root of a number without a calculator?
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