These are the most common measurements:

Small units of length are called **millimeters**.

A millimeter is about the **thickness of a plastic id card** (or credit card).

Or about the thickness of 10 sheets of paper on top of each other.

This is a very small measurement!

When we have 10 millimeters, it can be called a **centimeter**.

1 centimeter = 10 millimeters

A fingernail is about **one centimeter wide**.

**Two tape measures, one in mm, the other in cm**

**We can use millimeters or centimeters to measure how tall we are, or how wide a table is, but to measure the length of a football field it is better to use meters**.

**meter**

1 meter = 100 centimeters

**The length of this guitar is about 1 meter**

Meters can be used to measure the length of a house, or the size of a playground.

And because a centimeter is 10 millimeters:

1 meter = 1000 millimeters

The back of this kitchen chair is 1meter**A kilometer** is equal to 1000 meters.

1 kilometer = 1000 meters

When we need to get from one place to another, we measure the distance using **kilometers**.

The distance from one city to another or how far a plane travels can be measured using kilometers.

In Summary:

10 millimeters = 1 centimeter

100 centimeters = 1 meter

1000 meters = 1 kilometer

## Lots of Examples

A centimeter (cm) is about:

A meter (m) is about:

One meter is about one long step of an adult man. |

A kilometer (km) is about:

One kilometer is around a 12 minute walk. |