1. Percentage

2. Definition
Percent can be defined as “of
one hundred.” of
100

3. Definition
“Cent” comes from the Latin
and means 100.
Many words have come from the root cent such as century, centimeter,
centipede, & cent.

4. Definition CCC means three hundred. The letter C in Roman Numerals
stands for 100 or “cent”.
CCC means three
hundred.

5. Percent and Money If you understand money, learning
We write our change from a
dollar in hundredths.
If you understand
money, learning
percents is a breeze.

6. Comparing Money & Percents
$ .50 is ½ of a dollar
50% also means ½
$1.00
50¢ =
50¢

7. Comparing Money & Percents
50% means ½
50% of 6 stars is 3 stars
50% of =

8. Comparing Money & Percents
Fraction
Simplified
Percent
Decimal
Fraction
50%
.50 50
100 1 2 = = =

9. 50 parts out of 100 or 50 hundredths.
50 % Means
50 parts out of 100 or 50 hundredths. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

10. Comparing Money & Percents
$ .25 is ¼ of a dollar
25% also means ¼
$1.00
25¢ =

11. Comparing Money & Percents
25% means ¼
25% of 8 lemons is 2 lemons =
25% of

12. Comparing Money & Percents
Fraction
Simplified
Percent
Decimal
Fraction
25%
.25 25
100 1 4 = = =

13. 25 parts out of 100 or 25 hundredths.
25 % Means
25 parts out of 100 or 25 hundredths. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

14. Comparing Money & Percents
$ .10 is 1/10 of a dollar
10% also means 1/10
10¢
$1.00 =

15. Comparing Money & Percents
10% means 1/10
10% of 10 ice creams is 1 ice cream =
10% of

16. Comparing Money & Percents
Fraction
Simplified
Percent
Decimal
Fraction
10%
.10 10
100 1 10 = = =

17. 10 parts out of 100 or 10 hundredths.
10 % Means
10 parts out of 100 or 10 hundredths. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

18. 20 parts out of 100 or 20 hundredths.
20 % Means
20 parts out of 100 or 20 hundredths. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100

19. Percents Have Equivalents in Decimals and Fractions
Simplified
Percent
Decimal
Fraction
20%
.20 20
100 1 5 = = =

20. How to Find the Percent of a Whole Number
The first thing to remember is “of” means multiply in mathematics. of x =

21. How to Find the Percent of a Whole Number
Step 1 - When you see a percent problem you know when you read “of” in the problem you multiply. x
25% of 200

22. How to Find the Percent of a Whole Number
Step 2 – Change your percent to a decimal and then move it two places to the left. . .
25% x 200

23. How to Find the Percent of a Whole Number
Step 3 – Multiply just like a regular decimal multiplication problem.
200
x . 25
1000
+400
5000

24. How to Find the Percent of a Whole Number
Step 4 – Place the decimal point 2 places to the left in your answer.
200
x . 25
1000
+400 .
5000

25. What is the percent of this number?.
20 % of 820 . x
820
x . 20
000
+1640 .
16400

26. What is the percent of this number?. x
40 % of 725 . 1 2
725
x . 40
000
+2900 .
29000

27. What is the percent of this number?. x
60 % of 692 . 5 1
692
x . 60
000
+4152 .
21520