Metric Length
You can measure how long things are, or how tall, or how far apart they are. Those are are all examples of length measurements.
Example: This fork is 20 centimeters long
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 you 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
You might use millimeter or centimeters to measure how tall you are, or how wide a table is, but you would not use them to measure the length of football field. In order to do that, you can switch to meters.
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.
And because a centimeter is 10 millimeters:
1 meter = 1000 millimeters
A kilometer is equal to 1000 meters.
When you need to get from one place to another, you measure the distance using kilometers.
The distance from one city to another or how far a plane travels would be measured using kilometers.
Final thoughts about measuring length:
1 centimeter = 10 millimeters
1 meter = 100 centimeters
1 kilometer = 1000 meters
Lots of Examples
A centimeter (cm) is about:
 about as long as a staple
 the width of a highlighter
 the diameter of a belly button
 the width of 5 CD's stacked on top of each other
 the thickness of a notepad.
 the radius (half the diameter) of a US penny
A meter (m) is about:
 a little more than a yard (1 yard is exactly 0.9144 meters)
 the width of a doorway (most doorways are about 0.8 to 0.9 m)
 half the length of a bed
 the width of a large fridge
 the height of a countertop
 four rungs up a ladder
 five steps up a staircase
 the depth of the shallow end of a swimming pool
 the width of a dining table
 the height of a 5 year old
 shoulder to opposite wrist of an adult
 outstreched arms of a child
 waist high on an adult
A kilometer (km) is about:
 a little over half a mile
 a quarter of the average depth of the ocean
 how far you walk in 12 minutes
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