You can figure this out by taking the two nearest perfect squares that surround 70. Their roots will be the whole numbers that surround the square root of 70. In that case, the squares we want are 64 and 81, being eight squared and nine squared respectively. This means that the square root of seventy is somewhere between eight and nine.
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7-8
Nothing can fall "between 77". 77 is one number; you need an interval for any numbers to fall BETWEEN.
11 and 12
-15 and -14 or 14 and 15 <><><><><> Or, if you consider whole numbers to be positive integers, then just 14 and 15.
225 is the square of 15...