2. What you will learn…
Where percents come from
What percents are
What percents look like
Common percentages used in everyday life
Why we use percents
4. 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
5. What Percents are & Basic Info
Converts any quantity into a part of 100 to easily compare
6. What is a Percent?
Per cent
Per 100
÷ 100
%= parts per 100
25. Common Percentage Types
Original $24.99
Discount - 7.50
Sale Price $17.49
FL Tax Rate 6% = ?
Calculate
26. Common Percentage Types
Original $24.99
Discount - 7.50
Sale Price $17.49
FL Tax Rate 6% = ?
Calculate
27. Why do we use percents?
Compare different quantities
28. 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
29. 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%
Brad’s Math Test
45 questions correct
IF 50 questions total
30. Why do we use percents?
Kim’s Science Test
52 questions correct
IF 60 questions total
52 ?s
If 60 total ?s
o ?s 15 ?s 30 ?s 45 ?s 60 ?s
0% 25% 50% 75% 100%
≈ 87%
31. 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%
32. 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%
33. 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
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%
Brad’s Math Test
16 questions correct
IF 20 questions total
35. Why do we use percents?
Kim’s Science Test
16 questions correct
IF 24 questions total
16 ?s If 24 total ?s
o ?s 6 ?s 12 ?s 18 ?s 24 ?s
0% 25% 50% 75% 100%
≈ 65%
36. 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%
37. 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%
38. What you have learned…
Where percents come from
What percents are
What percents look like
Common percentages used in everyday life
Why we use percents
40. 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%
41. 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%
Notas do Editor
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.
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.
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.
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.
