It is 210 rounded to the nearest ten.
210
210 is the nearest 10 and 200 is the nearest 100.
209 to the nearest hundred is 200.
209 to the nearest hundreds = 200
200
200
So I'm sitting here wondering why on earth anyone would want to round to the nearest hundred and ten when I realized that's probably a two-part question. 209 to the nearest ten is 210. 209 to the nearest hundred is 200. If you really meant to ask to the nearest hundred and ten, transfer to another math class.
It is 210.
To the nearest hundred, 200
210
0.0478
700