It is 800, the middle number when they are arranged in order.
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800.
820 rounded to the nearest hundreds is 800
820,000,000
It is: 800 because 20 is less than 50
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.