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Percentage Basics & Introduction
- By Kari Knisely
What you will learn…


 Where percents came from

 What percents are

 What percents look like

 Where percents come from

 Why we use percents
Where did percents come from?




Merriam-Webster – click here for more information


Encyclopedia/Merriam-Webster – click here for more information




Merriam-Webster Dictionary. Retrieved on March, 24 2012 from http://www.merriam-
webster.com/dictionary/percent
What is a Percent?


     Per cent
      Per 100
        ÷ 100
   %= parts per 100
What does a percent look like?
What does a percent look like?

   40 Test Questions = 100% = 1.0
What does a percent look like?
   40 Test Questions = 100% = 1.0




         50%        50%
         20 ?s      20 ?s
         0.50       0.50
What does a percent look like?
   40 Test Questions = 100% = 1.0


           25%     25%
           10 ?s   10 ?s
           0.25    0.25
           25%     25%
           10 ?s   10 ?s
           0.25    0.25
What does a percent look like?
   40 Test Questions = 100% = 1.0
             12.5% 12.5%
             5 ?s  5 ?s
       12.5% 0.125 0.125 12.5%
       5 ?s              5 ?s
       0.125             0.125
        12.5%             12.5%
        5 ?s              5 ?s
        0.125 12.5% 12.5% 0.125
              5 ?s  5 ?s
              0.125 0.125
Is more than 100% possible?




             200%
Is more than 100% possible?




             175%

                              75%
Common Percentage Types
Common Percentage Types




                 Calculate
Common Percentage Types




                 Calculate
Common Percentage Types
Common Percentage Types




Calculate
Common Percentage Types




Calculate
Common Percentage Types
Common Percentage Types
                    Original     $24.99

                    Discount     - 7.50

                    Sale Price   $17.49

                    FL Tax Rate 6% = ?




Calculate
Common Percentage Types
                    Original     $24.99

                    Discount     - 7.50

                    Sale Price   $17.49

                    FL Tax Rate 6% = ?




Calculate
Why do we use percents?

Brad’s Math Test        Kim’s Science Test
45 questions correct    52 questions correct
IF 50 questions total   IF 60 questions total
Why do we use percents?




     Brad’s Math Test
     45 questions correct
     IF 50 questions total
Why do we use percents?




      Kim’s Science Test
      52 questions correct
      IF 60 questions total
Why do we use percents?
Why do we use percents?

Brad’s Math Test        Kim’s Science Test
45 questions correct    52 questions correct
IF 50 questions total   IF 60 questions total




 = 90%                      = 87%
Why do we use percents?

Brad’s Math Test       Kim’s Science Test
16 questions correct   16 questions correct
Why do we use percents?

Brad’s Math Test        Kim’s Science Test
16 questions correct    16 questions correct
IF 20 questions total   IF 24 questions total
Why do we use percents?




      Brad’s Math Test
      16 questions correct
       IF 20 questions total
Why do we use percents?




      Kim’s Science Test
      16 questions correct
      IF 24 questions total
Why do we use percents?
Why do we use percents?

Brad’s Math Test        Kim’s Science Test
16 questions correct    16 questions correct
IF 20 questions total   IF 24 questions total




   ≈ 80%                        ≈ 65%
What you have learned…



 Where percents came from

 What percents are

 What percents look like

 Where percents come from

 Why we use percents
Works Cited


 All images retrieved from Google images
Why do we use percents?

                                       16 ?s    If 20 total ?s
0 ?s        5 ?s   10 ?s           15 ?s           20 ?s


0%          25%     50%             75%             100%

                                      ≈ 80%


                            16 ?s              If 24 total ?s
 o ?s      6 ?s    12 ?s        18 ?s              24 ?s


 0%         25%     50%             75%             100%
                           ≈ 65%
Why do we use percents?
                                          45 ?s
                                            If 50 total ?s
0 ?s        12.5 ?s   25 ?s   37.5 ?s           50 ?s


0%          25%       50%        75%            100%
                                          ≈ 90%

                                        52 ?s
                                           If 60 total ?s
 o ?s      15 ?s      30 ?s    45 ?s            60 ?s


 0%         25%        50%      75%             100%
                                        ≈ 87%

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Tutorial1

  • 1. Percentage Basics & Introduction - By Kari Knisely
  • 2. What you will learn…  Where percents came from  What percents are  What percents look like  Where percents come from  Why we use percents
  • 3. Where did percents come from? Merriam-Webster – click here for more information Encyclopedia/Merriam-Webster – click here for more information Merriam-Webster Dictionary. Retrieved on March, 24 2012 from http://www.merriam- webster.com/dictionary/percent
  • 4. What is a Percent? Per cent Per 100 ÷ 100 %= parts per 100
  • 5. What does a percent look like?
  • 6. What does a percent look like? 40 Test Questions = 100% = 1.0
  • 7. What does a percent look like? 40 Test Questions = 100% = 1.0 50% 50% 20 ?s 20 ?s 0.50 0.50
  • 8. What does a percent look like? 40 Test Questions = 100% = 1.0 25% 25% 10 ?s 10 ?s 0.25 0.25 25% 25% 10 ?s 10 ?s 0.25 0.25
  • 9. What does a percent look like? 40 Test Questions = 100% = 1.0 12.5% 12.5% 5 ?s 5 ?s 12.5% 0.125 0.125 12.5% 5 ?s 5 ?s 0.125 0.125 12.5% 12.5% 5 ?s 5 ?s 0.125 12.5% 12.5% 0.125 5 ?s 5 ?s 0.125 0.125
  • 10. Is more than 100% possible? 200%
  • 11. Is more than 100% possible? 175% 75%
  • 19. Common Percentage Types Original $24.99 Discount - 7.50 Sale Price $17.49 FL Tax Rate 6% = ? Calculate
  • 20. Common Percentage Types Original $24.99 Discount - 7.50 Sale Price $17.49 FL Tax Rate 6% = ? Calculate
  • 21. Why do we use percents? Brad’s Math Test Kim’s Science Test 45 questions correct 52 questions correct IF 50 questions total IF 60 questions total
  • 22. Why do we use percents? Brad’s Math Test 45 questions correct IF 50 questions total
  • 23. Why do we use percents? Kim’s Science Test 52 questions correct IF 60 questions total
  • 24. Why do we use percents?
  • 25. Why do we use percents? Brad’s Math Test Kim’s Science Test 45 questions correct 52 questions correct IF 50 questions total IF 60 questions total = 90% = 87%
  • 26. Why do we use percents? Brad’s Math Test Kim’s Science Test 16 questions correct 16 questions correct
  • 27. Why do we use percents? Brad’s Math Test Kim’s Science Test 16 questions correct 16 questions correct IF 20 questions total IF 24 questions total
  • 28. Why do we use percents? Brad’s Math Test 16 questions correct IF 20 questions total
  • 29. Why do we use percents? Kim’s Science Test 16 questions correct IF 24 questions total
  • 30. Why do we use percents?
  • 31. Why do we use percents? Brad’s Math Test Kim’s Science Test 16 questions correct 16 questions correct IF 20 questions total IF 24 questions total ≈ 80% ≈ 65%
  • 32. What you have learned…  Where percents came from  What percents are  What percents look like  Where percents come from  Why we use percents
  • 33. Works Cited  All images retrieved from Google images
  • 34. Why do we use percents? 16 ?s If 20 total ?s 0 ?s 5 ?s 10 ?s 15 ?s 20 ?s 0% 25% 50% 75% 100% ≈ 80% 16 ?s If 24 total ?s o ?s 6 ?s 12 ?s 18 ?s 24 ?s 0% 25% 50% 75% 100% ≈ 65%
  • 35. Why do we use percents? 45 ?s If 50 total ?s 0 ?s 12.5 ?s 25 ?s 37.5 ?s 50 ?s 0% 25% 50% 75% 100% ≈ 90% 52 ?s If 60 total ?s o ?s 15 ?s 30 ?s 45 ?s 60 ?s 0% 25% 50% 75% 100% ≈ 87%

Editor's Notes

  • #22: Can we assume Kim did better than Brad because she got more questions right even though there were different amounts of questions on the tests? ? 100 is an easy number to work with. If we compare the two test scores out of parts per 100 then we can compare them evenly.
  • #26: Can we assume Kim did better than Brad because she got more questions right even though there were different amounts of questions on the tests? ? 100 is an easy number to work with. If we compare the two test scores out of parts per 100 then we can compare them evenly.
  • #27: Can we assume Kim did better than Brad because she got more questions right even though there were different amounts of questions on the tests? ? 100 is an easy number to work with. If we compare the two test scores out of parts per 100 then we can compare them evenly.
  • #28: Can we assume Kim did better than Brad because she got more questions right even though there were different amounts of questions on the tests? ? 100 is an easy number to work with. If we compare the two test scores out of parts per 100 then we can compare them evenly.
  • #32: Can we assume Kim did better than Brad because she got more questions right even though there were different amounts of questions on the tests? ? 100 is an easy number to work with. If we compare the two test scores out of parts per 100 then we can compare them evenly.