5 and 6.
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7-8
11 and 12
The square root of 99 falls between the whole numbers 9 and 10.Because 102 = 100and 92 = 8199 is between 81 and 100, so when you square root it, it falls between 9 and 10.
3 and 4 since 3^2 is 9 an 4^2 is 16
-15 and -14 or 14 and 15 <><><><><> Or, if you consider whole numbers to be positive integers, then just 14 and 15.