Use benchmarks to approximate each square root to the nearest tenths.

Question

square root  

Answer 1

You have some numbers (which you have not shared) and you want their square roots?  A perfect application for a calculator. You do the rounding.

 

I don't know about benchmarks--if you are required to use them, please DEFINE them as given in your class.  But it does not seem to me that any such thing is useful.