Name 15.2 ? Geometry and Measurement—4.8.A, 4.8.B Also 4.8.C MATHEMATICAL PROCESSES 4.1.F, 4.1.G Customary Units of Length Essential Question How can you convert customary units of length? Unlock Unlock the the Problem Problem You can use a ruler to measure length. A ruler that is 1 foot long shows 12 inches in 1 foot. A ruler that is 3 feet long is called a yardstick. There are 3 feet in 1 yard. How does the size of a foot compare to the size of an inch? Activity Materials ■ 1-inch grid paper ■ scissors ■ tape STEP 1 Cut out the paper inch tiles. Label each tile 1 inch. 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch STEP 2 Place 12 tiles end-to-end to build 1 foot. Tape the tiles together. 1 foot 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch STEP 3 Compare the size of 1 foot to the size of 1 inch. 1 foot © Houghton Mifflin Harcourt Publishing Company 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch So, 1 foot is _ times as long as 1 inch. Think: You need 12 inches to make 1 foot. Math Talk Mathematical Processes How many inches would you need to make a yard? Explain. Module 15 525 Example 1 Convert larger units to smaller units. Emma has 4 feet of thread to make some bracelets. How many inches of thread does Emma have? Since 1 foot is 12 times as long as 1 inch, you can write feet as inches by multiplying the number of feet by 12. Make a table that relates feet and inches. Feet Inches 1 12 Think: 1 foot × 12 = 12 inches 2 2 feet × 12 = __ 3 3 feet × _ = __ 4 4 feet × _ = __ 5 5 feet × _ = __ So, Emma has _ inches of thread. Example 2 Convert smaller units to larger units. Jason ran 300 feet during recess. How many yards did Jason run? Make a table that relates feet and yards. Yards 120 120 feet ÷ 3 = 150 150 feet ÷ 3 = 210 210 feet ÷ _ = __ 240 240 feet ÷ _ = __ 300 300 feet ÷ _ = __ So, Jason ran _ yards during recess. Math Talk Mathematical Processes Explain how making a table helped you solve the problem. • What if Emma had 5 feet of thread? Would she have enough thread to make the bracelets? Explain. 526 © Houghton Mifflin Harcourt Publishing Company Feet Name Share Share and and Show Show 1. Compare the size of a yard to the size of a foot. Use a model to help. Customary Units of Length 1 foot (ft) = 12 inches (in.) 1 yard (yd) = 3 feet 1 yard (yd) = 36 inches 1 yard 1 yard is _ times as long as _ foot. Complete. 2. 2 feet = _ inches 3. 3 yards = _ feet 4. 12 feet = _ yards 5. 7 yards = _ feet 6. 144 inches = _ feet 7. 72 feet = _ yards Math Talk Mathematical Processes Problem Problem Solving Solving 8. Multi-Step Joanna has 3 yards of fabric. She needs 100 inches of fabric to make curtains. Does she have enough fabric to make curtains? Explain. Make a table to help. If you measured the length of your classroom in yards and then in feet, which unit would have a greater number of units? Explain. Yards Inches 1 2 3 © Houghton Mifflin Harcourt Publishing Company 9. Justify Hannah’s room is 14 feet wide. She says that her room is 160 inches wide. Is Hannah correct? Explain your answer. Write Math Show Your Work Module 15 • Lesson 2 527 Mathematical Processes M Model ¥ Reason ¥ Communicate M Daily Daily Assessment Assessment Task Task Fill in the bubble completely to show your answer. 10. A spool of thread contains 6 yards of thread. How many feet of thread are on the spool? Yards Feet 1 3 A 6 feet 2 B 9 feet 3 C 18 feet D 2 feet 4 5 6 11. Which statement about 8 yards and 25 feet is true? A 25 feet = 8 yards B 25 feet < 8 yards C 8 yards > 25 feet D 8 yards < 25 feet 12. Multi-Step Carla has 3 feet of ribbon. She needs 38 inches of ribbon to wrap a present. How many more inches of ribbon does Carla need? A 2 inches B 35 inches C 29 inches D 3 inches TEXAS Test Prep 13. Jim is putting carpet in his basement. The length of his basement 528 A 4 feet B 15 feet C 36 feet D 432 feet © Houghton Mifflin Harcourt Publishing Company is 12 yards. How many feet is the length of his basement? H o mewo rk and Practice 15.2 Geometry and Measurement— 4.8.A, 4.8.B Also 4.8.C MATHEMATICAL PROCESSES 4.1.F, 4.1.G Name Customary Units of Length Complete. 1. 3 feet =_ inches Customary Units of Length 2. 5 yards = _ inches 1 foot (ft) = 12 inches (in.) 1 yard (yd) = 3 feet 1 yard (yd) = 36 inches 3. 4 yards = _ feet 5. 9 feet = _ yards 4. 72 inches = _ yards 6. 60 inches = _ feet Problem Problem Solving Solving 7. Conor has a roll of fence that is 25 feet long. He needs 8 yards Yards of fence to go around a flower bed. Does he have enough fence to go around the flower bed? Explain. Make a table to help you. Feet 1 2 3 4 8. If you measured the width of a window in inches and then in feet, which measurement would have the greater number of units? Explain your answer. © Houghton Mifflin Harcourt Publishing Company 9. Ginny’s house is 20 yards long. She says that the house is 720 feet long. Is Ginny correct? Explain your answer. Module 15 • Lesson 2 529 TEXAS Test Prep Lesson Lesson Check Check Fill in the bubble completely to show your answer. A 15 feet = 3 yards B 15 yards = 3 feet C 15 feet = 5 yards D 15 yards = 5 feet 12. Hailey has a 5-foot long extension cord. 60 inches and 6 feet is true. Which statement did he write? A 60 inches = 6 feet B 60 inches > 6 feet C 6 feet < 60 inches D 6 feet > 60 inches 13. Alex’s driveway is 27 yards long and She wants to know its length in inches. How many inches long is the cord? 10 yards wide. How many feet long is the driveway? A 60 inches A 9 feet B 180 inches B 81 feet C 15 inches C 972 feet D 48 inches D 324 feet 14. Multi-Step A roll of tape is 50 yards long. How many pieces of tape 2 inches long can be cut from the tape? 530 11. The statement Evan wrote comparing A 150 B 9,000 C 900 D 300 15. Multi-Step Vicky has a 50 inch roll of ribbon. She uses 3 feet of the ribbon to wrap a gift. How many inches of ribbon does she have left? A 4 inches B 41 inches C 14 inches D 24 inches © Houghton Mifflin Harcourt Publishing Company 10. Which statement is true?

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