Units of Length

This lecture series introduces the units of length (or distance) in the metric and U.S. customary systems. Watch the videos and complete the interactive exercises.

Practice

Estimating length (mm, cm, m, km) - Answers

1. 5 meters is the closest to the height of a giraffe.

2. Centimeters is the most reasonable unit to measure the height of a coffee cup.

3. The most reasonable distance for a student to travel from their house to their school is 1 kilometer.

4. Kilometers is the most reasonable unit to measure the distance from China to Japan.

5. Meters is the most reasonable unit to measure the length of a school bus.

6. The width of a strawberry is about 20 millimeters.

7. The length of a wrist watch is about 20 centimeters.