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?
