7 m | 1 cm | 6 km | 9 cm |

= ? m | = ? m | = ? m | = ? m |

When comparing distances using metric units, there are 4 common units to compare: millimeters (mm), centimeters (cm), meters (m), and kilometers (km).

- 1 kilometer (km) = 1,000 meters (m)
- 1 meter (m) = 100 centimeters (cm)
- 1 centimeter (cm) = 10 millimeters (mm)