7.3.3 finding the total
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7.3.3 finding the total Presentation Transcript

  • 1. Lesson 7.1 , For use with pages 343-346 Write the fraction in simplest form. Write two fractions that are equivalent to the given fraction. 1. 13 52 2. 21 9
  • 2. Lesson 7.1 , For use with pages 343-346 Write the fraction in simplest form. Write two fractions that are equivalent to the given fraction. 1. 13 52 ANSWER 1 4 2. 21 9 ANSWER 3 7’ 6 14
  • 3. Finding the Total Also called the BASE
  • 4. Essential Questions
    • Where are different situations percents are used in real life?
    • As a consumer, why is it important for you to know about percents?
  • 5.
    • Today will we look at the 3 rd and last type of percent set-up. We will be looking for the “total” amount or some times called the “base”.
    • part %
    • total 100
  • 6.
    • The total is very easy to identify because it follow the word “OF”.
    • For example, 20% of _____ is 10
    • And, as the other 2 types, some of these you will be able to do mentally, while others require the use of a proportion
    50
  • 7. Mentally solve these problems
    • 15 is 10% of ________
    • (think : 10% or 1/10 of ???? Is 15)
    • 12 is 100% of ______
    • 83 Is 100% of ______
    • 40 Is 50% of _______
    • 5 Is 25% of _______
    150 12 83 80 20
  • 8. EXAMPLE 3 Finding a Base 24 is 0.8% of what number? x = 3000 25 x = 0.8 100 0.8x 25( 100) = 0.8x 3,000 = 0.8 0.8
  • 9.
    • If you left a 20 % tip for your meal, how much did the meal cost if the tip was $2.55?
    x = $12.75 2.55 x = 20 100 20x 2.55( 100) = 20x 255 = 20 20
  • 10. Using a proportion
    • 75% of what number is 15?
    x = 20 15 x = 75 100 75x 15( 100) = 75x 1,500 = 75 75
  • 11. Using a proportion
    • 16 is 200% of ______?
    x = 8 16 x = 200 100 200x 16( 100) = 200x 1,600 = 200 200
  • 12. Using a proportion
    • 8 % of ______ is 20.
    x = 250 20 x = 8 100 8x 20( 100) = 8x 2,000 = 8 8
  • 13.
    • Of the passengers on an international flight, 36% were Americans. If there were 81 American passengers, how many total passengers were on the plane?
    x = 225 81 x = 36 100 36x 81( 100) = 36x 8,100 = 36 36
  • 14.
    • There were 35 boys out for football this fall. This represents only about 5% of the total enrollment of the building. About how many students are in the building?
    x = 700 35 x = 5 100 5x 35( 100) = 5x 3,500 = 5 5
  • 15. Homework
    • Worksheet 63-64
      • Page 63: Do column A
      • Page 64: All
      • You MUST show a PROPORTION for EVERY problem.