The two most common systems of measurement are the customary system and the metric system.
If we do conversion within customary system or metric system, it is called converting units within measurement systems.
That is, we are not doing conversion of units from customary to metric or metric to customary.
The table given below is much useful to do conversion of units within customary and metric systems.
Question :
Use a model to do the following conversion.
Convert 12 feet into yards
Convert 18 yards into feet
Solution :
Let us write ratios of feet to yards from the above model.
3/1, 6/2, 9/3, 12/4
From the above equivalent ratios, it is clear that for an increase of every yard, there is an increment of 3 feet.
So, the ratio of feet to yards in any measurement from the above model is
3 feet / 1 yard
To convert 12 feet into yards, we have to change the first quantity in the above ratio as 12 using multiplication.
3 / 1 = (3x4) / (1x4) = 12 feet / 4 yards
Therefore, 12 feet = 4 yards.
To convert 12 feet into yards, we have to change the second quantity of the ratio 3/1 as 18 using multiplication.
3 / 1 = (3x18) / (1x18) = 54 feet / 18 yards
Therefore, 18 yards = 54 feet.
Example 1 :
Convert 3.5 yards into inches.
Solution :
Here, we convert bigger unit into smaller unit. So we have to multiply.
3.5 yards = 3.5 x 36 inches
3.5 yards = 126 inches
Example 2 :
Convert 3.5 tons into pounds .
Solution :
Here, we convert bigger unit into smaller unit. So we have to multiply.
3.5 tons = 3.5 x 2000 pounds
3.5 tons = 7000 pounds
Example 3 :
Convert 24 quarts into gallons
Solution :
Here, we convert smaller unit into bigger unit. So we have to divide.
24 quarts = 24 / 4 gallons
24 quarts = 6 gallons
Example 4 :
Convert 3.5 decimeters into centimeters.
Solution :
Here, we convert bigger unit into smaller unit. So we have to multiply.
3.5 dm = 3.5 x 10 cm
3.5 dm = 35 cm
Example 5 :
Convert 48 milligrams into centigrams.
Solution :
Here, we convert smaller unit into bigger unit. So we have to divide.
48 milligrams = 48 / 10 centigrams
48 milligrams = 4.8 centigrams
Example 6 :
Convert 3.5 deciliters into centiliters.
Solution :
Here, we convert bigger unit into smaller unit. So we have to multiply.
3.5 deciliters = 3.5 x 10 centiliters
3.5 deciliters = 35 centiliters
Example 7 :
David travels 60 miles in two hours. How many yards of distance will he cover in one minute ?
Solution :
Distance covered in 2 hours = 60 miles
Distance covered in 1 hour = 30 miles
We know that 1 hour = 60 minutes and 1 mile = 1760 yards
1 hour ---> 30 miles ===> 60 minutes -----> 30 x 1760 yards
60 minutes -----> 52800 yards
So, distance covered in 60 minutes = 52800 yards
Distance covered in one minute = 52800 / 60 yards
= 880 yards
Example 8 :
Mark jogged 15840 feet in 45 minutes. Find the speed of Mark in feet per minute.
Solution :
Speed = Distance / Time
Speed = 15840 / 45
Speed = 352 feet per minute
Example 9 :
Use a fraction to find the length in meters of a tile that is 9 centimeters long.
Solution :
Here, we convert smaller unit (centimeters) into bigger unit (meters). So we have to divide.
Since we divide, we have to use the fraction 1/100.
Because, 1 meter = 100 centimeters
9 centimeters = 9 x 1/100 meters
9 centimeters = 9/100 meters
Example 10 :
Kevin has a pole that is 24 meters tall. If Kevin sets the pole on a 300 centimeters stand, how far from the floor will the top of the pole be (in meters) ?
Solution :
Height of the pole = 24 meters
Height of the stand = 300 centimeters = 300/100 = 3 m
Distance from the floor to the top of the pole is
= Height of the stand + Height of the pole
= 30 + 3
= 33 meters
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