It is best to do this on a calculator. If you want to do it without one, you can try different numbers, to see which number, when squared, is closest to 10. For example, 3 squared is 9, and 4 squared is 16, so the square root of 10 is obviously between those two. Faster methods exist, too.
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The square root of 10 is 3.162278
10,000,000,000 The square root of 10^20 is 10^10
The square root of 10 is about 3.16227766.
100
The square root of 10^6 is 10^3, or 1000.