2.1 6th

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2.1 6th

  1. 1. 2.1<br />Measuring Lengths<br />
  2. 2. Customary Units<br />Copy this in your spiral notebook<br />Inch – length of a small paper clip<br />Foot – distance from elbow to knuckle (12 inches)<br />Yard – width of a door (3 feet)<br />
  3. 3. Metric Units<br />Copy this in your spiral notebook<br />Millimeter –width of a ship won (gold ship wons or penny)<br />Centimeter – width of your little finger<br />Meter height of a chair<br />
  4. 4. Activity – Do This<br />Measure how long your book is in paperclips.<br /> height <br /> width<br />Math Text Book<br />
  5. 5. A paper clip is about 1 inch long. About how long is your textbook.<br />
  6. 6. Activity – Do This<br />Using your finger tips, estimate the width of your book.<br />
  7. 7. EXAMPLE 1<br />Using Customary Units of Length<br />
  8. 8. EXAMPLE 1<br />Using Customary Units of Length<br />Find the length of the caterpillar to the nearest inch<br />
  9. 9. EXAMPLE 1<br />EXAMPLE 1<br />Using Customary Units of Length<br />Using Customary Units of Length<br />Find the length of the caterpillar to the nearest inch<br />
  10. 10. EXAMPLE 1<br />Using Customary Units of Length<br />Find the length of the caterpillar to the nearest inch<br />ANSWER <br />
  11. 11. EXAMPLE 1<br />Using Customary Units of Length<br />Find the length of the caterpillar to the nearest inch<br />ANSWER <br />The caterpillar is about 2 inches long.<br />
  12. 12. EXAMPLE 2<br />Using Metric Units of Length<br />
  13. 13. EXAMPLE 2<br />Using Metric Units of Length<br />Find the length of the seashell to the nearest millimeter.<br />
  14. 14. EXAMPLE 2<br />Using Metric Units of Length<br />Find the length of the seashell to the nearest millimeter.<br />
  15. 15. EXAMPLE 2<br />Using Metric Units of Length<br />Find the length of the seashell to the nearest millimeter.<br />ANSWER <br />
  16. 16. EXAMPLE 2<br />Using Metric Units of Length<br />Find the length of the seashell to the nearest millimeter.<br />ANSWER <br />The seashell is about 45millimeters long.<br />
  17. 17. EXAMPLE 3<br />Choosing Appropriate Tools<br />
  18. 18. EXAMPLE 3<br />Choosing Appropriate Tools<br />Choose an appropriate measuring tool for the length. Explain your reasoning.<br />
  19. 19. EXAMPLE 3<br />Choosing Appropriate Tools<br />Choose an appropriate measuring tool for the length. Explain your reasoning.<br />a. width of a calculator<br />
  20. 20. EXAMPLE 3<br />Choosing Appropriate Tools<br />Choose an appropriate measuring tool for the length. Explain your reasoning.<br />a. width of a calculator<br />b. length of a bus<br />
  21. 21. EXAMPLE 3<br />Choosing Appropriate Tools<br />Choose an appropriate measuring tool for the length. Explain your reasoning.<br />a. width of a calculator<br />b. length of a bus<br />SOLUTION<br />
  22. 22. EXAMPLE 3<br />Choosing Appropriate Tools<br />Choose an appropriate measuring tool for the length. Explain your reasoning.<br />a. width of a calculator<br />b. length of a bus<br />SOLUTION<br /> The width of a calculator is less than one foot and less than 30 centimeters.So, you should use a foot ruler or a centimeter ruler to measure the length.<br />a.<br />
  23. 23. EXAMPLE 3<br />Choosing Appropriate Tools<br />Choose an appropriate measuring tool for the length. Explain your reasoning.<br />a. width of a calculator<br />b. length of a bus<br />SOLUTION<br /> The width of a calculator is less than one foot and less than 30 centimeters.So, you should use a foot ruler or a centimeter ruler to measure the length.<br />a.<br />The length of a bus is greater than one yard and greater than one meter.So, you should use a tape measure to measure the length.<br />b.<br />
  24. 24. EXAMPLE 4<br />Choosing Appropriate Units<br />
  25. 25. EXAMPLE 4<br />Choosing Appropriate Units<br />Choose an appropriate customary unit and metric unit for the length. Explain your reasoning.<br />
  26. 26. EXAMPLE 4<br />Choosing Appropriate Units<br />Choose an appropriate customary unit and metric unit for the length. Explain your reasoning.<br />distance from Boston to Chicago<br />
  27. 27. EXAMPLE 4<br />Choosing Appropriate Units<br />Choose an appropriate customary unit and metric unit for the length. Explain your reasoning.<br />distance from Boston to Chicago<br />height of a full grown tree<br />
  28. 28. EXAMPLE 4<br />Choosing Appropriate Units<br />SOLUTION<br /> The distance from Boston to Chicago is much greater than one yard and much greater than one meter. So, use miles or kilometers.<br />a.<br />
  29. 29. The height of a tree is much greater than either one inch or one centimeter. The height is also much less than either one mile or one kilometer. So, use feet, yards, or meters.<br />b.<br />EXAMPLE 4<br />Choosing Appropriate Units<br />SOLUTION<br /> The distance from Boston to Chicago is much greater than one yard and much greater than one meter. So, use miles or kilometers.<br />a.<br />
  30. 30. EXAMPLE 5<br />Estimating Length Using Benchmarks<br />
  31. 31. EXAMPLE 5<br />Estimating Length Using Benchmarks<br />Estimate the height, in meters, of the door below. Measure to check.<br />
  32. 32. EXAMPLE 5<br />Estimating Length Using Benchmarks<br />Estimate the height, in meters, of the door below. Measure to check.<br />STEP 1 To estimate, imagine how high the door is in “chairs.”<br />
  33. 33. EXAMPLE 5<br />Estimating Length Using Benchmarks<br />Estimate the height, in meters, of the door below. Measure to check.<br />STEP 1 To estimate, imagine how high the door is in “chairs.”<br />STEP 2 To check your estimate, measure the door with a meterstick.<br />
  34. 34. EXAMPLE 5<br />Estimating Length Using Benchmarks<br />Estimate the height, in meters, of the door below. Measure to check.<br />STEP 1 To estimate, imagine how high the door is in “chairs.”<br />STEP 2 To check your estimate, measure the door with a meterstick.<br />ANSWER <br />
  35. 35. EXAMPLE 5<br />Estimating Length Using Benchmarks<br />Estimate the height, in meters, of the door below. Measure to check.<br />STEP 1 To estimate, imagine how high the door is in “chairs.”<br />STEP 2 To check your estimate, measure the door with a meterstick.<br />ANSWER <br />The door is about 2 “chairs” high, which is about 2 meters. The height of the door is just over 2 meters.<br />

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