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  3. The square root of 800 is between which of the following integers?

The square root of 800 is between which of the following integers?

admin2011-02-20  107
问题 The square root of 800 is between which of the following integers?
选项 A、21 and 25
B、24 and 28
C、27 and 31
D、30 and 34
E、33 and 37
答案C
解析 The best solution here is to plug in the numbers from the answers until you find the range that works. 21×21=441, 24×24=576, 25×25=625, 27×27=729, 28×28=784, 30×30=900... and we do not need to determine the square of 31 to know that the square root of 800 is between 27 and 31.
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