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The square root of 66 will be between 8 and 9, closer to 8. 8.1 is too low, 8.2 is too high. 8.12 is low, 8.13 is high. 8.124 is close enough.
7
The square root of 66 is a little bit greater than 8. So, plotted on a number line, it would be just to the right of the number 8.
The square root of 49 is 7 and the square root of 64 is 8 so it has to be between 7 and 8 (and it's probably closer to 7)
8 and 9