Lesson: Using proportions to convert customary units
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Lesson Objective
We will be able to convert customary units of measurement.
Lesson Plan
Do Now: (5 minutes)
1) At a bakery, muffins come in dozens and individual serving containers of orange juice come in packs of 8. If Tiera needs to have the same amount of muffins as orange juice containers, what is the least possible number of sets of each she needs to buy?
1) At a bakery, muffins come in dozens and individual serving containers of orange juice come in packs of 8. If Tiera needs to have the same amount of muffins as orange juice containers, what is the least possible number of sets of each she needs to buy?
2) Write 72 ½ % as a fraction and a decimal.
Direct Instruction: (20 minutes)
Give students the following table with one unit missing from each ratio. Have them fill in what they can on their own and then check as a class.
Rates for measurement:
Length Weight Capacity
1 foot /12 inches 1 pound /16 ounces 1 cup /8 fluid ounces
1 yard / 3 feet 1 ton /2,000 pounds 1 pint /2 cups
1 mile / 5,280 feet 1 quart/ 2 pints
1 gallon/ 4 quarts
Last week we learned that proportions are really just what? How do you think proportions can help us today with converting customary units of measurement?
Ex. Convert 20 feet into inches
Model setting up the proportion. Be sure to emphasize that the same units must be across from each other. We can use our conversion chart as one ratio. When we are converting units of measurement we are showing a proportional relationship.
Have students add definition for unit ratio to their notes.
Unit ratio the denominator is 1 unit
Ex. Convert 20 feet into inches
Model setting up the proportion. Be sure to emphasize that the same units must be across from each other. We can use our conversion chart as one ratio. When we are converting units of measurement we are showing a proportional relationship.
To convert customary units of measurement:
1) Set up a proportion. Use the unit ratio for one side.
2) Solve for the variable.Have students add definition for unit ratio to their notes.
Unit ratio the denominator is 1 unit
Guided Practice: (10 minutes)
Ex. Convert 15 quarts into gallons.
Ex. Convert 15 quarts into gallons.
Ex. Convert 4 ½ feet to yards.
Ex. Convert 3 1/2 pounds to ounces.
Ex. Convert 5 yards to inches.
Assessment:(10 minutes)
Converting customary units workout
Ex. Convert 3 1/2 pounds to ounces.
Ex. Convert 5 yards to inches.
Assessment:(10 minutes)
Converting customary units workout
Lesson Resources
converting customary units work out Assessment 
1,691

Customary Measurement Conversions Notes 
1,830

Comments
thank you