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.
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800
Tio the nearest 10, it is 0.
As it ends with a five, it will round up, so 30 is the nearest 10.
10
The answer is 10