Length
 | Measuring how long things are, how tall they are, or how far apart they might be are all examples of length 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!
Centimeters
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When you have something that is 10 millimeters, it can be said that it is 1 centimeter.
1 centimeter = 10 millimeters
A fingernail is about one centimeter wide.
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You might use centimeters to measure how tall you are, or how wide a table is, but you would not use it to measure the length of football field. In order to do that, you would switch to meters.
Meters
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A meter is equal to 100 centimeters.
1 meter = 100 centimeters
The length of this guitar is about 1 meter
Meters might be used to measure the length of a house, or the size of a playground.
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Kilometers
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When you need to get from one place to another, you will need to measure that distance using kilometers. A kilometer is equal to 1,000 meters.
The distance from one city to another or how far a plane travels would be measured using kilometers.
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Final thoughts about measuring length:
1 centimeter = 10 millimeters
1 meter = 100 centimeters
1 kilometer = 1000 meters
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