Have not gotten to that in my granddaughter's math....but I would imagine taking it to the common denominator first and go from there. That's how you do fractions.
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you do the square root of the number
The square roots of 81 are integers, not fractions. So there are no sensible ways to express them as fractions.
It is: 6 square root 5 and it's just like adding fractions with the same denominators
A square root is simplified when: -The radicand has no perfect square factors other than 1 -The radicand has no fractions -There are no square roots in the denominator *Radicand: the number and/or variables underneath the square root sign
An integer is a whole number without fractions or decimals