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Percents by Proportions
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Percents by Proportions

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Students learn how to solve percents by using proportions.

Students learn how to solve percents by using proportions.

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Transcript

  • 1. Finding Percents
    EdTech 521
    Asynchronous Lesson
    By Cassie Koch
    8th Grade Math
  • 2. Lesson
    View presentation
    Quiz Star:
    http://quizstar.4teachers.org/indexs.jsp
    Virtual Field Trip:
    http://edtech2.boisestate.edu/kochc/521/indian_education/home.html
  • 3. Percents in the Real World
    Grades
    Shopping
    Travel
    Chemistry
    Weather
    Interest
    Sales Tax
    Tips
  • 4. What are Percents?
    A part of the whole
    Example: What percent of Pizza is left?
    Whole = 8 slices
    Part left = 4
    Ratio: Part = 4 = 1= 0.5 = 50%
    Whole 8 2
  • 5. Use Proportions
    Set your part over whole ratio equal to “p” over 100.
    Part = p
    Whole 100
    Pizza Example:
    4 = p
    8 100
  • 6. Solving Proportions
    4 = p
    8 100
    Cross multiply:
    4x 100 = 8 xp
    400 = 8p
    Solve for p
    400 = p
    8
    P = 50%
  • 7. Example:
    What percent of 162 is 90?
    Part = 90
    Whole = 162
    90 = p
    162 100
    Cross Multiply
    90 x 100 = 162 xp
    900 = 162p
    Solve for p
    900 = p
    162
    P= 56%
  • 8. Your Turn
    24 is what percent of 60?
  • 9. Your Turn Cont.
    Part=
    24
    Whole =
    60
    24 = p
    60 100
    2400 = 60p
    p = 40%
  • 10. Take the Quiz
    Go to Quiz Star:
    http://quizstar.4teachers.org/indexs.jsp
    Login: edtech521
    Password: edtech521
  • 11. Virtual Field Trip
    Go to:
    http://edtech2.boisestate.edu/kochc/521/indian_education/home.html
    Study about the tribes in Montana.
    Answer the three questions on each tribe in a Google doc
    Draw the tribe’s reservations in the map.
  • 12. Resources
    Pizza Image:
    http://ocmboces.org/clt/larmstrong/K2sites/Armstrong/Math/numsense/numsense.htm