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Warm Up

Learn about the customary system used in the United States for length, weight, and capacity measurements. Practice estimating measurements and choosing appropriate units. Includes examples and quizzes.

robertcohen
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Warm Up

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  1. Warm Up Problem of the Day Lesson Presentation Lesson Quizzes

  2. Warm Up Simplify. 3 8 1 4 1. 2. 3 4 1 2 3. 4.

  3. Problem of the Day Maria rented an electric car at a rate of $40 per day and $0.15 per mile. She returned the car the same day, gave the rental clerk a $100 bill, and got $21.75 back in change. How far did Maria drive the car? 255 miles

  4. Learn to understand and select appropriate customary units of measure.

  5. Vocabulary customary system

  6. Customary Units of Length Unit Abbreviation Benchmark Inch in. Width of your thumb Foot ft Distance from your elbow to your wrist Yard yd Width of a classroom door Mile mi Four times around a track If you do not have an instrument, such as a ruler, scale, or measuring cup, you can estimate the length, weight, and capacity of an object by using a benchmark. The customary system is the measurement system often used in the United States. It includes units of measurement for length, weight, and capacity.

  7. Additional Example 1: Choosing Appropriate Units of Length What unit of measure provides the best estimate? A. A doorway is about 7 _____ high. B. A calculator is about 6 _____ long. Think: The height of a doorway is about 7 times the distance from your elbow to your wrist. A doorway is about 7 ft high. Think: The length of a calculator is about 6 times the width of your thumb. A calculator is about 6 in. long.

  8. Check It Out: Example 1 What unit of measure provides the best estimate? A. A 4-door sedan is about 5 _____ long. B. A student’s desk is about 3 _____ long. Think: The length of a sedan is about 5 times the width of a classroom door. A 4-door sedan is about 5 yd long. Think: The length of a students desk is about 3 times the distance from your elbow to your wrist. A student’s desk is about 3 ft long.

  9. Customary Units of Weight Unit Abbreviation Benchmark Ounce oz A slice of bread Pound lb A loaf of bread Ton T A small car

  10. Additional Example 2: Choosing Appropriate Units of Weight What unit of measure provides the best estimate? A. A loaf of bread weighs about 16 _____ . B. A bike could weigh 20 _____ . Think: A loaf of bread has a weight of about 16 slices of bread. A loaf of bread weighs about 16 oz. Think: A bike could have a weight of about 20 loaves of bread. A bike could weigh 20 lbs.

  11. Check It Out: Example 2 What unit of measure provides the best estimate? A. A black rhino could weigh about 1 _____ . B. A DVD remote control weighs about 8 ____ . Think: A black rhino has a weight of about a small car. A black rhino can weigh about 1 T. Think: A DVD remote control has a weight of about 8 slices of bread . A DVD remote control weighs about 8 oz.

  12. Customary Units of Capacity Unit Abbreviation Benchmark Fluid ounce fl oz A spoonful Cup c A glass of juice Pint pt A small bottle of salad dressing Quart qt A small container of paint Gallon gal A large container of milk Capacity deals with volume, or the amount a container can hold.

  13. Additional Example 3: Choosing Appropriate Units of Capacity What unit of measure provides the best estimate? A large water cooler holds about 10 _____ t of water. Think: A large water cooler holds 10 times the amount of a large container of milk. A large water cooler holds about 10 gal of water.

  14. Check It Out: Example 3 What unit of measure provides the best estimate? A small fish aquarium holds about 20 _____ t of water. Think: A small fish aquarium holds 20 times the amount of a small container of paint. A small fish aquarium holds about 20 qt of water.

  15. 1 2 5 8 The line segment is closest to 1 in. 5 8 The length of the line segment is about 1 in. Additional Example 4: Estimating Measurements Use the ruler to measure the length of the line segment to the nearest half, fourth, or eighth of an inch.

  16. 1 2 1 4 3 8 The line segment is between 1 and 1 in. 1 4 The length of the line segment is closest to 1 in. Check It Out: Example 4 Use the ruler to measure the length of the line segment to the nearest half, fourth, or eighth of an inch.

  17. Lesson Quizzes Standard Lesson Quiz Lesson Quiz for Student Response Systems

  18. 1 2 Lesson Quiz What unit of measure provides the best estimate? 1. A row boat is 10 _____ long. 2. A skateboard is 30 _____ long. 3. A pair or earphones weighs 4 _____. 4. Drinking water is delivered in 5 _____ bottle. 5. Estimate the length of the line segment to the nearest half, fourth, or eighth of an inch. ft in. oz gal 2 in.

  19. Lesson Quiz for Student Response Systems 1. What unit of measure provides the best estimate? A door is about 7 ___ tall. A. in. B. ft C. ydD. mi

  20. Lesson Quiz for Student Response Systems 2. What unit of measure provides the best estimate? A shoe is about 12 ___ long. A. in. B. ft C. ydD. mi

  21. Lesson Quiz for Student Response Systems 3. What unit of measure provides the best estimate? An adult cat weighs 8 ___. A. oz. B. lb C. TD. gal

  22. Lesson Quiz for Student Response Systems 4. What unit of measure provides the best estimate? A carton of milk in the cafeteria contains 1 ___. A. fl oz. B. qt C. cD. gal

  23. Lesson Quiz for Student Response Systems 5. Estimate the length of the line to the nearest half, fourth, or eighth of an inch. A. B. C. D.

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