10"1",687 look to the number in the thousands place. If it is 5 or less, do not round up. If it is 5 or more, round up. the "1" is in the thousands place. It is 5 or less, so the answer would be 101,000. 17"3",245 -- the "3" is in the thousands place and is less than 5, so do not round up. = 173,000.