800
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810810
To round 811 to the nearest 10, we look at the digit in the tens place, which is 1. Since 1 is less than 5, we keep the tens digit the same and change all digits to the right to zero. Therefore, rounding 811 to the nearest 10 gives us 810.
If it is an ordered list then it is 811.
8.55 = 811/20
between 405 and 406.