To round to the nearest hundred thousand, look at the digit in the column to the right, the ten thousands. 8 is in the the ten thousands column. The rule is, if the number is 5 or more round up.

If the number ends in five or more round it up. 156 is rounded up to 160. But if it’s four or less, then round the numbers down. To round a number to the nearest hundred, look at the tens digit ...