If you mean .820 then it is 0.91 rounded to the nearest hundredth
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Any Windows calculator would have told you - 28.63564212 is the answer
820 rounded to the nearest hundreds is 800
You can use a calculator to get its decimal value: 28.6356. Or you can simplify it by finding numbers that are factors of 820 that are squares ... 4 x 205 = 820 and so √820 = √4 x √205 = 2√205.
820
It's already there.