These are the most common measurements:


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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!

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

1 centimeter = 10 millimeters

A fingernail is about one centimeter wide.


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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

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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

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The back of this kitchen chair is 1meter

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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:

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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:

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

A kilometer (km) is about:

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One kilometer is around a 12 minute walk.