Lesson
Page
Measurement 




In the
metric system,
length, weight, and capacity has one
basic unit of measure.

The
metric system
is another system of measurement used to describe an object's length,
mass, or volume. It uses one
base unit and adds
prefixes. The metric
system uses
the powers of
ten as the conversion
factors from unit
to unit.

Meter
is
the base unit for measuring
length. 

Gram
is the base unit for measuring
mass. 

Liter
is the base unit for measuring
volume. 

Metric
Units of Length 
Kilometer
(km) 
1
km = 1,000 m 
A
kilometer is about the length of 100 school buses lined up
end to end. 


Meter
(m) 
1
m = 100 cm 
A
meter is about half the height of a door. 


Decimeter
(dm) 
1
dm = 10 cm 
A
decimeter is about the width of your teacher's hand. 


Centimeter
(cm) 
1
cm = 10 mm 
A
centimeter is about the width of a pencil. 



Conversions 
The
chart above shows the relationships between the units of
length, mass, and volume. You can use the chart to
change a measurement from one unit to another unit. 
How
many centimeters are in 2 meter? 
To
change from a larger unit of length to a smaller unit of
length, multiply. 
2
meter = ___ centimeters 
Think:
1 m = 100 cm 
2
x 100 = 200 
2
meters = 200 centimeters 
How
many meters are in 5000 kilometers? 
To
change from a smaller unit of length to a larger unit of
length, divide. 
5000
m = ___ km 
Think:
1000 m = 1 km 
5000
divided by 1000 = 5 
5000
m = 5 kilometers 

Let's
Practice!
click
here

Remember:
To measure smaller
amounts, divide the basic unit
into parts of ten, a hundred, or a thousand.
To measure larger
amounts, multiply the basic unit
by ten, a hundred, or a thousand.

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