How can you round 2.1 km to the nearest meter?

To round 2.1 km to the nearest meter, you first need to convert kilometers to meters. Since 1 km is equal to 1000 meters, 2.1 km is equal to 2100 meters. To round to the nearest meter, you look at the digit in the units place - in this case, it's 0. Since 0-4 rounds down and 5-9 rounds up, 2100 meters rounded to the nearest meter is 2100 meters.