Textbook Page 185 – 186; # 14 – 28 Even & 32 – 37 All

Warm UpWrite each percent as a fraction.

1) 70%

2) 40%

3) 85%

4) 16%

5) 3%

Section 4 – 3Proportions & Percent

EquationsObjectives:

To use proportions when solving percent problems

To write and solve percent equations

T-Shirts are regularly $20

How much am I saving?

What will be the discounted price of each T-Shirt?

You can solve percent problems by writing and solving a proportion!

𝑛100

=𝑝𝑎𝑟𝑡h𝑤 𝑜𝑙𝑒

Example 1 Finding the Part

A) Express is selling jeans for 30% off the original price of $50. How much money will I save on each pair of jeans?

B) Best Buy is having a sale. They are taking 25% off of all TVs. If you want to buy a 55’’ LED TV that costs $1,500, how much will you save?

C) Find 75% of 320.

D) 30% of 70 is what number?

Example 2 Finding the Percent

A) Passaic Valley High School students have a 6 ½ hour school day. What percentage of the day do they spend in school?

B) What percent of 80 is 18?

C) 18 is what percent of 90?

Example 3 Finding the Whole

A) You buy a pair of shoes and on your receipt it says you saved $15. If they were marked down 30%, how much did the shoes cost originally?

B) 15% of what number is 24?

C) 20 is 40% of what number?

Summary

Ticket Out

1) What is 35% of 160

2) What percent of 450 is 36?

3) 32 is 80% of what number?

Homework

Practice 4 – 3 Ditto; #1 – 23.