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TSO
834 rounded to the nearest hundred is 800 because 834 is closer to 800 than it is to 900.

It is 34 ones away from 834, while it is 66 ones away from 900.
We want to round to the hundreds place, so we need to look at the digit in the tens place.

The digit in the tens place is 0.

Because 0 is less than 5, we round down to 800.