Warm up Use your reference sheet How many inches are in a foot? How many feet are in a mile? How many ounces equals a pound? 1 kilogram is how many grams? Bonus* How many ounces are in a gallon?

You can use the following benchmarks to help you understand fluid ounces, tons, and other customary units of measure. Weight of 3 apples Pound (lb) Weight of a buffalo Ton Amount of water in 2 tablespoons Fluid ounce (fl oz) Capacity Capacity of a standard measuring cup Cup (c) Capacity of a large milk jug Gallon (gal) Weight of a slice of bread Ounce (oz) Weight Length of 4 laps around a track Mile (mi) Length of a standard sheet of paper Foot (ft) Length of a small paper clip Inch (in.) Length Customary Unit

Additional Example 1: Choosing the Appropriate Customary Unit Choose the most appropriate customary unit for each measurement. Justify your answer. A. the weight of a car tons; The weight of a car is similar to the weight of a buffalo. B. the diameter of a soup can inches; The diameter of a soup can is similar to the length of a few paper clips. C. the weight of a newborn baby pounds; The weight of a newborn baby is similar to the weight of more than a dozen apples.

Check It Out: Example 1 Choose the most appropriate customary unit for each measurement. Justify your answer. A. the length of a pen top inch; The length of a pen top is similar to the length of a small paper clip. B. the weight of a pitcher of juice pounds; The weight of a pitcher of juice is similar to the weight of about 10 apples. C. the capacity of a jar of peanut butter cups; The capacity of a jar of peanut butter is similar to the capacity of 2 standard measuring cups.

Additional Example 2: Converting Customary Units Convert 5,000 pounds to tons. Method 1: Use a proportion. Write a proportion using a ratio of equivalent measures. pounds tons 2,000 1 5,000 m x = 2,000 • x = 1 • 5,000 2000x = 5,000 x = 2.5 5,000 pounds is equal to 2.5 tons.

Check It Out: Example 2 Convert 24 pints to cups. Method 1: Use a proportion. Write a proportion using a ratio of equivalent measures. cups pints 2 1 c 24 = 1 • c = 2 • 24 c = 48 24 pints is equal to 48 cups.

Additional Example 3: Adding or Subtracting Mixed Units of Measure Allison orders a 6-ounce grilled chicken sandwich. Dominic orders a quarter-pound grilled chicken sandwich. Which sandwich weighs more? Explain. First convert a quarter-pound to ounces. ounces pounds 16 1 x 0.25 Write a proportion using 16 oz = 1 lb. = x = 4 oz Allison’s sandwich weighs more because Dominic’s sandwich is only 4 oz.

Check It Out: Example 3 Tedd and Fergie go the hardware store to purchase a bag of nails. Tedd buys a bag of nails that weighs 7 pounds 8 ounces. Fergie buys a bag of nails that weighs 128 ounces. Which bag of nails weighs more? Explain. First convert 7 pounds to ounces. ounces pounds 16 1 x 7 Write a proportion using 16 oz = 1 lb. = x = 112 oz + 8 oz x = 120 oz Fergie’s bag of nails weigh more because Tedd’s bag only weighs 120 oz.

Lesson Quiz: Part I Choose the most appropriate customary unit for each measurement. Justify your answer. 1. the capacity of a bathtub 2. the weight of a calculator 3. the length of an indoor sports arena gallons; similar to the capacity of several large milk jugs ounces; similar to the weight of several slices of bread too small to measure in miles, so it should be measured in feet

Lesson Quiz: Part II 4. Convert 13 gallons to quarts. 5. Seth is returning from a 5-mile hike. He passes a trail sign that says, “3,520 feet to base camp.” How many more miles does Seth have to hike? 52 2 3 mi