How you do it is, go to the tens place which is 3, now round it, you then go to the ones place, if the number is bigger than 4 then that would make the 3 a 4 and the ones place would just be a 0, if the ones place is less than 5 then the tens place would just be its normal number which is 3 and the ones place would be a 0 again, so the ones place is a 1 and that is less than 5, so the tens place would be the same, so then the answer would be 672,830!