1. Percent Proportion
Pg. 332

2. Ratios and Proportions
Definition?
Ways to express?
Proportion
How to write one?

3. Percent proportion
One ratio (fraction) compares part of a quantity to the whole quantity.
The other ratio is the equivalent percent written as a fraction (denominator = 100).
4 out of 5 is 80%
Part 4 = 80 Percent
Whole out of 100

4. Key Concept Type Example Proportion Find the percent
What percent of 5 is 4?
4 = n
Find the part
What number is 80% of 5?
p = 80
Find the whole
(the # following ‘of’)
4 is 80% of what number?
4 = 80
W 100

5. whole Part = percent Let’s do some together!
What percent of $15 is $9?
What number is 40% of 120?
18 is 25% of what number?
whole
Part = percent

6. whole Part = percent Your Turn! What percent of 25 is 20?
What number is 5% of 60?
40% of what number is 26?
whole
Part = percent

7. Logical How many students are wearing blue shirts?
How many students are in the class?
What percent of the class is wearing blue?
Now…make up your our percent proportion. Use any data from our class that you can gather.

8. Zoo
If 200 of the 550 reptiles in a zoo are on display, what percent of the reptiles are on display?
Round to the nearest whole number.

9. Pies
Miss Murphy ate 15% of the pies at Thanksgiving dinner. If she ate 3 pies, how many pies were there?
Now using the same proportion, create your own problem involving a percent.

10. Homework Time… Use these notes to assist you on your homework.
Use your time wisely…you don’t want homework over the weekend