1. 3.10 Using Percents To convert fractions and decimals
to percent (and vice versa)
To solve equations involving percent

2. Percent The ratio of a number to 100.
Can be converted to a fraction or to a decimal.

3. To convert a % into a Decimal…
Move the decimal over two spots to the left and drop the %

4. Write as a decimal: 137% =
1.37

5. Write as a decimal: 0.5% =
00000
0.005

6. Write as a decimal: 100% = 1

7. To convert the % into a fraction...
Drop the percent sign put the number over 100 and reduce if possible

8. Write as a fraction: 29% =

9. Write as a fraction: 14% =

10. Write as a fraction: 37.5% =
•10
÷25
Cannot leave fractions or decimals in fractions

11. Write a Fraction as a %
Set your fraction = to x/100 and solve for x

12. Write as a percent:
Cross-product 

13. Write as a percent:
Cross-product 

14. Solving % Problems
Is = % Of

15. 15% of 60 is what number?
9 = x

16. 30% of what number is 27

17. What is 20% of 45

18. What percent of 30 equals 66?

19. Steps Read the question thoroughly a few times
Write down information the problem gives you
Form an equation
Solve
Check your answer

20. The tax on an car was 6% of its price
The tax on an car was 6% of its price. What was the price of the car if the tax was $633?
-Price of car ? X
-Tax is 6 % of price of car (x)
-Total tax is $ (x) = 633
-Solve x = 633/0.06
x = 10,550
-Check the price of the car was $ If we find 6% of 10,550 we get $633 so it checks out 

21. Assignment: Page 156 2-50 (even)

22. Solve: Write as a decimal: 2) 60% 4) 1% 6) 180% 8) 0.6%
10) 2.8% Express as a percent (round to tenth):
Solve: