Length
Lesson
Topic Index | Grade 5 Math | Intermediate Test Prep | StudyZone

The millimeter (mm), centimeter (cm), decimeter (dm), meter (m), and kilometer (km) are metric units of length. These units are used when measuring length, height, width, depth, or distance.

Millimeter is the smallest metric unit of length.

Kilometer is the largest metric unit of length.

Millimeter is one thousandth of a meter. The width of a piece of paper Centimeter (cm) is one hundredth of a meter. The width of a paper clip. Decimeter (dm) is one tenth of a meter. The height of a big apple. Meter (m) is a unit of measure, a little more than a yard long. A bat is about 1 m long. Kilometer (km) is 1,000 meters. Nine football fields are about 1 km long.

Look at each item below. Use the references above to help you decide if the measurement is close to a mm, cm, dm, m or km. Then check your answer.