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.
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If you mean .820 then it is 0.91 rounded to the nearest hundredth
Any Windows calculator would have told you - 28.63564212 is the answer
Press the square root button on your calculator.
The square root of 1225 is 35.
square root(105) = 10.2469508