How Dow you round to the hundreds 12.261

The place that is right after the decimal is the hundreds place. In this case it is. 2. You look to the number behind it. If that number is 5 or greater you round the two up. If that number is 4 or less then you round the 2 down to 2 with nothing behind it. The 6 is greater than 5 so the 2 rounds up and new number becomes

12.3