Explanation: A square root of a number is one of the number's two equal factors.
You can also multiply by the numbers.
[tex]9*9=81[/tex]
Then, dividing into the groups of 81.
[tex]81/9=9[/tex]
[tex]\sqrt{9^2=9*9=81}[/tex]
9 is the square root of 81.
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