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2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
2.1 6th
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2.1 6th

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

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