1. Finding a Percent of a Number

2. SPI 0606.2.6 Solve problems involving ratios, rates and percents.

3. 100 Definition of Percent per
Percent can be defined as a ratio that compares a number to 100 or “per one hundred.”
per
100

4. Percents Have Equivalents in Decimals and Fractions
100
Do you know how to write 20% as a fraction and as a decimal

5. 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

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

7. Copy the following slides into your notebook, while your teacher reads them aloud to you!

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

9. 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

10. 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

11. 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

12. 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

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

14. Your Turn ! See if you can solve the following problems and then check your answers

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

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

17. Let’s see how we will do with a word problem

18. On Saturday, Alma made 70% of the sales at a store where she works
On Saturday, Alma made 70% of the sales at a store where she works. The total amount of sales at the store on Saturday was $910. What was Alma’s total amount of sales on Saturday?

19. What is the percent of this number?
910
x . 70
000
+6370 .
63700

20. Outstanding Work! Your teacher will provide you with a worksheet that includes additional problems for you to solve