The
customary system
is another system of measurement used in the United States to describe
how long, how heavy, or how big something is.

Inch,
foot, yard, and mile are units for measuring
area, perimeter, and volume. 
Length:
12
inches (in) = 1 foot (ft)
3 feet = 1 yard (yd)
5280 feet = 1 mile (mi) 

The
area
of a figure is the number of
square units needed to cover it. 

Count
the number of square units to find the area. 
Area = 9
square in. 
You can also
find the area of a square or rectangle by using a
formula.
Area =
length x width

Area = 3 x 3
Area = 9
square in. 

Perimeter
is the word used to describe
the distance around the outside of an object or shape. To find the perimeter
of any shape, add the lengths of its sides. 

When two
pairs of sides are the same
length, multiply 2 times the
length and 2 times the width. Then
add the products. 
( 2 x 10 ft. ) + ( 2 x 4
ft.)
= 
Perimeter:
20 ft. + 8 ft. =
28 ft. 

When all
the sides are the same
length, multiply the
number of sides times the
length of one side. 
4 sides x 3 yd 
Perimeter
4 x 3 =
12 yd 

When the
lengths of the sides are
different,
add the lengths of
the sides. 
5 in. + 10 in. + 7 in. = 
Perimeter:
22 in. 

The
Volume
of a solid is the number of
cubic units it
contains. 

This is one cubic unit 
Find the
cubic measure by counting the cubes. 

5 cubic units 
You can
also find the volume of a
rectangular prism
by using a formula. 
Volume = length x width x height 


Volume
= 4 in. x 2 in. x 5
in.
Volume
=
40 cubic in. 

Let's
Practice!
click
here

Remember:
Use square units, a
2dimensional measure, to talk about area.
Use
cubic units, a
3dimensional measure, to talk about volume. 
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