NEAREST HUNDRED
The nearest hundred would round off the third place to the left of the decimal.
56879.8 rounded to the nearest hundred is 56900
In 56879.8 is the hundred place. The "7" next to it determines to round up because 7 is greater than 4.
If the digit was 4 or less, then round down (the answer would be 56800)
NEAREST HUNDREDTH
The hundredth decimal place is the second one after the dot.
56879.8 rounded to the nearest hundredth is 56879.80