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VERY SIMPLE SQUARE ROOT QUESTION

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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by MRED » Mon May 26, 2008 10:49 am
How would you calculate the square root of 13.60? My calculator tells me it is 3.7, and that is correct, but how is that calculated? I tried to duplicate that answer using long-hand division, and I just can not do it.
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Source: — Quantitative Reasoning |
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by kausis » Tue May 27, 2008 3:52 am
Usually these questions can be answered by looking at the choices offered.

So you know that the square of 3 is 9 and the square of 4 is 16. So, first you must eliminate any answers that are <3>=4. This should typically leave you with only a couple of answers. From these you can calculate by actually calculating the squares of the possible answers and checking which comes closest to the 13.6.

Hope this helps!
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