Convert 240,000 millimeters to kilometers. What is the correct conversion?

To convert millimeters to kilometers, it is essential to recognize the metric relationships between these units. There are 1,000 millimeters in a meter and 1,000 meters in a kilometer. Hence, there are 1,000,000 millimeters in a kilometer (1 km = 1,000 m x 1,000 mm/m).

To convert 240,000 millimeters to kilometers, one should divide the number of millimeters by 1,000,000:

240,000 mm ÷ 1,000,000 mm/km = 0.24 km.

This calculation indicates that 240,000 millimeters is equivalent to 0.24 kilometers, which matches the first choice. Thus, the correct conversion of 240,000 millimeters to kilometers is indeed 0.24 kilometers.