1. 7.8 Percents, Decimals and Fractions
I can convert numbers into percents
7.8 Percents, Decimals and Fractions
I can transform numbers from one form to another

2. Compare percent, decimal and fractions
Simplified
Percent
Decimal
Fraction
50%
.50 50
100 1 2 = = =
Copyright © 2000 by Monica Yuskaitis

3. 50 % Means 50 parts out of 100 or 50 hundredths. 1 2 3 4 5 6 7 8 9 1011 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
Copyright © 2000 by Monica Yuskaitis

4. = 25% of 25% means ¼ 25% of 8 lemons is 2 lemons
Copyright © 2000 by Monica Yuskaitis

5. Comparing Fractions & Percents
Simplified
Percent
Decimal
Fraction
25%
.25 25
100 1 4 = = =
Copyright © 2000 by Monica Yuskaitis

6. 25 % Means 25 parts out of 100 or 25 hundredths. 1 2 3 4 5 6 7 8 9 1011 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
Copyright © 2000 by Monica Yuskaitis

7. I can solve real world problems involving percents
7.9 Percent Problems
I can solve real world problems involving percents

8. Find 35% of 20.
7 or 7.00 20
x .35
100 60
7.00
d. Why is seven right?

9. 7.10 Applying Percents
I can solve percent problems that involve discounts, tips and sales tax

10. Review from yesterday….
Find the percent of each number.
1. 75% of 300
2. 93% of 56
3. 32% of 128
4. 9% of 60
225
52.08
40.96
5.4

11. Common Uses of Percents
Sales tax is an amount added to the price of an item.
sales tax = price • sales tax rate
total cost = price + sales tax
Sales tax
A tip is an amount added to a bill for service.
tip = bill • tip rate
total cost = bill + tip
Tips
A discount is an amount that is subtracted from the regular price of an item.
discount = price • discount rate
total cost = price – discount
Discounts
Common Uses of Percents

12. Percent Tips…..
You can find 10% of a number by moving the decimal point one place to the left.
You can find 1% of a number by moving the decimal point two places to the left.
You can find 5% of a number by finding one- half of 10% of the number.

13. To multiply by 0.10, move the decimal point one place left.
Remember!

14. Discounts
A fishing store is having a 10% off sale. If Gerald wants to buy a fishing pole whose regular price is $39.95, how much will he pay for the pole after the discount?

15. Tips
Ben’s dinner bill is $7.85. He wants to leave a tip that is 15% of the bill. How much should his tip be?

16. Sales Tax
Ann is buying a dog bed for $ The sales tax rate is 7%. How much will the total cost of the dog bed be?

17. There is a discount of 25% off on a $60 pair of shoes
There is a discount of 25% off on a $60 pair of shoes. How much are the shoes?
$15 %
c. Why is fifteen dollars wrong?

18. There is a discount of 25% off on a $60 pair of shoes
There is a discount of 25% off on a $60 pair of shoes. How much are the shoes?
$45
$60
x .25
300
120
$15.00
$60
- 15
d. Why is forty-five dollars correct?
$45

19. A shirt cost $30 plus 7% tax. What is the total cost?
$32.10
$30
x .07
$2.10
$30.00
+ 2.10
$32.10
d. Why is thirty-two dollars and ten cents correct?