Here's how to convert kilometers (km) to millimeters (mm):

Understanding the Conversion

* Kilometer (km): A unit of distance equal to 1000 meters.

* Meter (m): The base unit of length in the metric system.

* Millimeter (mm): A unit of distance equal to one-thousandth of a meter (1/1000 m).

Conversion Factor

1 kilometer (km) = 1,000,000 millimeters (mm)

Steps

1. Multiply by 1,000,000: To convert kilometers to millimeters, multiply the number of kilometers by 1,000,000.

Example

Let's say you have 2.5 kilometers (km) and want to convert it to millimeters (mm):

2.5 km * 1,000,000 mm/km = 2,500,000 mm

Therefore, 2.5 kilometers is equal to 2,500,000 millimeters.