Identify Equivalent Metric Units of Lengths
Lesson
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Identify equivalent metric units of length

 

The metric system is another system of measurement used to describe an object's length, mass, or volume.

The base unit for measuring length is the meter.

  The metric system also uses prefixes to describe amounts that are larger or smaller than the  base units. The most common prefixes are kilo-, meaning 1,000; centi-, meaning 1/100, and milli-, meaning 1/1,000.

millimeter, centimeter, meter, and kilometer are units for measuring length. The millimeter is the smallest unit in this system, and the kilometer is the largest unit.

 

Length

 

Kilometer

 

km 1,000 9 football fields
Meter m 1 Half the height of
a door
Centimeter cm 1/100 length of a raisin
Millimeter mm 1/1,000 Width of a period at the end of a sentence

 

If the item being measured is:


How do you choose which unit to use?
Here are some hints!

   smaller than the length of your pencil point

  Use  a millimeter (mm.) 
 since 10 millimeters (mm) =  1 centimeter (cm)

 smaller than your height, but longer than your foot

   Use  a centimeter (cm.) 
 since 100 centimeters = 1 meter (m)

longer than the length of your classroom, but shorter than a walk around the block

   Use a meter (m.)
since 1 meter = 1,000 kilometers = 1 km (km)

longer than the distance from your house to school (if you ride a bus)

   Use a kilometer (km.)
 

 

This dime measures approximately 3 cm.

 

 

Basic Conversion Rule:

To convert from a LARGER unit to a SMALLER unit...MULTIPLY

To convert from a SMALLER unit to a LARGER unit...DIVIDE

 

Example  #1:     0.25 m = ____ cm
                             0.25 x 100 = 25 cm

Remember: 1 meter = 100 centimeters


Example #2:     5 mm = _____ m
                           50 1,000  = 0.05 m
 

Remember: 1 meter = 1000 millimeters

Let's Practice?

 
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