|
 The
customary system
is a 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
length. |
|
|
Length:
12
inches (in) = 1 foot (ft)
3 feet = 1 yard (yd)
5280 feet = 1 mile (mi)
1,760 yards = 1 mile (mi) |
|
|
Conversions |
| The
chart above shows the relationships between the units of
length. You can use the chart to
change a measurement from one unit to another unit. |
| How
many inches are in 4 feet? |
To change
from a larger unit of length to a smaller unit of length,
multiply or add. |
| 4
feet = ___ inches |
Think:
1 ft = 12 inches |
|
12 + 12 + 12 + 12 = 48
OR
4
x 12 = 48 |
4
feet = 48 inches |
| How
many yards are in 18 feet? |
To
change from a smaller unit of length to a larger unit of
length, divide or subtract. |
| 18
feet = ___ yards |
Think:
3 ft = 1 yd |
You can subtract groups of
3 from 18.
18 - 3 = 15, 15 -
3 = 12, 12 -
3 = 9,
9 - 3 = 6, 6 -
3 = 3, 3 -
3 = 0
You can take 6 groups of
3 feet
from 18 feet.
OR
You can divide.
18 ÷
3 =
6 |
18
feet = 6 yards |
|
Click on the ruler for
practice.
Click on the ruler for
more practice.
 Remember: |
The customary system
can describe an object's length
.
|
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