It's between 2 and 3. You know this because the next two surrounding perfects squares are 4 and 9, which have square roots of 2 and 3 respectively.
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Rounded to two decimal places, the square root of 70 is equal to ±8.37. Therefore, the square root of 70 is between the numbers -9 or -8, or 8 and 9.
The square root of 73 is between 8 and 9.
The square root of 57 is between 7 and 8
The square root of 75 lies between 8 and 9.
7 is the square root of 49 and 8 is the square root of 64.