Introduction to Percent Proportion

12/6 Percent Introduction

by Samantha Ratliff

Open Ended

How would you describe what a "percent" is?

Can you answer this?​

​A toy skateboard is on sale for 50% off. The original price is $12. What is the new price?

What do you notice about the answer?

​A toy skateboard is on sale for 50% off. The original price is $12.

​The new price is $6.

​

​More? Less? Part? Whole?

Can you answer this?​!

​A real skateboard is on sale for 28% off. The original price is $48. What is the new price?

​We can use proportions!

​REMEMBER THIS: (aka write it down in your notebook)

​25% of 65 is?

​

56% of 45 is what number?​

What percent of 69 is 153?

What percent of 1800 is 36?

Multiple Choice

Try it :)

12 is 80% of what number?

• 9.6

• 15

• 666

Multiple Choice

Try it :)

20 is 40% of what number?

• 8

• 800

• 50

Multiple Choice

How do you set this up?

What is 25% of 250?

• $$\frac{25}{100}=\frac{250}{x}$$  

• $$\frac{25}{100}=\frac{x}{250}$$  

• $$\frac{250}{100}=\frac{25}{x}$$  

Multiple Choice

How do you set this up?

15 is what percent of 90?

• $$\frac{15}{90}=\frac{x}{100}$$  

• $$\frac{90}{15}=\frac{x}{100}$$  

• $$\frac{15}{90}=\frac{100}{x}$$