# Converting Within Measurement Systems. ESSENTIAL QUESTION How do you convert units within a measurement system? 6.RP.1.3d

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1 L E S S O N 7.3 Converting Within Measurement Systems Use ratio reasoning to convert measurment units; manipulate and transform units appropriately when multiplying or dividing quantities. Also 6.RP.1.3 ESSENTIAL QUESTION How do you convert units within a measurement system? EXPLORE ACTIVITY Using a Model to Convert Units The two most common systems of measurement are the customary system and the metric system. You can use a model to convert from one unit to another within the same measurement system. STEP 1 Use the model to complete each statement below. 1 yard = 3 feet 2 yards = feet 3 yards = feet 4 yards = feet Rewrite your answers as ratios. Since 1 yard = 3 feet, the ratio of feet to yards in any measurement is always This means any ratio forming a proportion with can represent a ratio of feet to yards. Reflect 1. Communicate Mathematical Ideas How could you draw a model to show the relationship between feet and inches? Lesson

2 Converting Units Using Proportions and Unit Rates You can use ratios and proportions to convert both customary and metric units. Use the table below to convert from one unit to another within the same measurement system. 1 ft = 12 in. 1 yd = 36 in. 1 yd = 3 ft 1 mi = 5,280 ft 1 mi = 1,760 yd 1 km = 1,000 m 1 m = 100 cm 1 cm = 10 mm Customary Measurements Length Weight Capacity 1 lb = 16 oz 1 T = 2,000 lb Metric Measurements 1 c = 8 fl oz 1 pt = 2 c 1 qt = 2 pt 1 qt = 4 c 1 gal = 4 qt Length Mass Capacity 1 kg = 1,000 g 1 g = 1,000 mg 1 L = 1,000 ml My Notes EXAMPLE 1 What is the weight of a 3-pound human brain in ounces? Use a proportion to convert 3 pounds to ounces. Use STEP 1 to convert pounds to ounces. Write a proportion. Use common denominators to write equivalent ratios. The weight is 48 ounces. 3 is a common denominator. Equivalent rates with the same denominators have the same numerators. A moderate amount of daily sodium consumption is 2,000 milligrams. What is this mass in grams? Use a proportion to convert 2,000 milligrams to grams. Use to convert milligrams to grams. 186 Unit 3

3 STEP 1 Write a proportion. Write equivalent ratios. Think: You can multiply 1,000 2 = 2,000. So multiply the denominator by the same number. Equivalent ratios with the same numerators have the same denominators. YOUR TURN The mass is 2 grams. 2. The height of a doorway is 2 yards. What is the height of the doorway in inches? How would you convert 3 liters to milliliters? Converting Units by Using Conversion Factors Another way to convert measurements is by using a conversion factor. A conversion factor is a ratio comparing two equivalent measurements. EXAMPLE 2 Elena wants to buy 2 gallons of milk but can only find quart containers for sale. How many quarts does she need? You are converting to quarts from gallons. STEP 1 Find the conversion factor. Write 4 quarts = 1 gallon as a ratio: Multiply the given measurement by the conversion factor. Cancel the common unit. Elena needs 8 quarts of milk. Lesson

4 YOUR TURN 3. An oak tree is planted when it is 250 centimeters tall. What is this height in meters? Guided Practice Use the model below to complete each statement. (Explore Activity 1) Use ratios and proportions to solve. (Example 1) 3. Mary Catherine makes 2 gallons of punch for her party. How many cups of punch did she make? 4. An African elephant weighs 6 tons. What is the weight of the elephant in pounds? 5. The distance from Jason s house to school is 0.5 kilometer. What is this distance in meters? 6. The mass of a moon rock is 3.5 kilograms. What is the mass of the moon rock in grams? Use a conversion factor to solve. (Example 2) A package weighs 96 ounces. What is the weight of the package in pounds? ESSENTIAL QUESTION CHECK-IN 10. A jet flies at an altitude of 52,800 feet. What is the height of the jet in miles? 11. How do you convert units within a measurement system? 188 Unit 3

5 Name Class Date 7.3 Independent Practice 6.RP.1.3, 12. What is a conversion factor that you can use to convert gallons to pints? How did you find it? 13. Three friends each have some ribbon. Carol has 42 inches of ribbon, Tino has 2.5 feet of ribbon, and Baxter has 1.5 yards of ribbon. Express the total length of ribbon the three friends have in inches, feet and yards. 14. Suzanna wants to measure a board, but she doesn t have a ruler to measure with. However, she does have several copies of a book that she knows is 17 centimeters tall. a. Suzanna lays the books end to end and finds that the board is the same length as 21 books. How many centimeters long is the board? b. Suzanna needs a board that is at least 3.5 meters long. Is the board long enough? Explain. Sheldon needs to buy 8 gallons of ice cream for a family reunion. The table shows the prices for different sizes of two brands of ice cream. Price of small size Price of large size Cold Farms \$2.50 for 1 pint \$4.50 for 1 quart Cone Dreams \$4.25 for 1 quart \$9.50 for 1 gallon 15. Which size container of Cold Farm ice cream is the better deal for Sheldon? Explain. 16. Multistep Which size and brand of ice cream is the best deal? Lesson

6 17. In Beijing in 2008, the Women's 3,000 meter Steeplechase became an Olympic event. What is this distance in kilometers? 18. How would you convert 5 feet 6 inches to inches? FOCUS ON HIGHER ORDER THINKING 19. Analyze Relationships A Class 4 truck weighs between 14,000 and 16,000 pounds. a. What is the weight range in tons? b. If the weight of a Class 4 truck is increased by 2 tons, will it still be classified as a Class 4 truck? Explain. Work Area 20. Persevere in Problem Solving A football field is shown at right. a. What are the dimensions of a football field in feet? b. A chalk line is placed around the perimeter of the football field. What is the length of this line in feet? c. About how many laps around the perimeter of the field would equal 1 mile? Explain 21. Look for a Pattern What is the result if you multiply a number of cups by and then multiply the result by Give an example. 22. Make a Conjecture 1 hour = 3,600 seconds and 1 mile = 5,280 feet. Make a conjecture about how you could convert a speed of 15 miles per hour to feet per second. Then convert. Houghton Mifflin Harcourt Publishing Company Image credits: Michael Steele/ Getty Images 190 Unit 3

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