How many millimeters are in one meter?

One meter is equivalent to 1000 millimeters because the metric system is based on powers of ten, making conversions straightforward. The prefix "milli-" means one-thousandth, so one millimeter is one-thousandth of a meter. Therefore, to find out how many millimeters are in one meter, you multiply the number of meters (1) by 1000. This fundamental aspect of the metric system helps students understand conversions easily, reinforcing their grasp of measurements.