Proportions and Percent Proportions

​Percent Proportions

​Review of 7th grade proportion problems created by Mrs. Ratliff

Open Ended

Do you remember how to solve for x in the following proportion? Describe the steps to solve for x.

$$\frac{x}{35}=\frac{8}{20}$$  

​Solving a Proportion

​1. Cross multiply to create an equation.

​

2. Solve for "x"​

​

Multiple Choice

Solve for x.

$$\frac{48}{x}=\frac{20}{30}$$  

• 16

• 72

• 32

• 1440

Open Ended

What is a "percent" and how are they used in MONEY math?

​Percents in "Real Life"

• interest on a loan

• Taxes

• Tips

• Sales

• Grades!

• Food Labels

• Gasoline (percent grade)

• and more...

Multiple Select

Select all the choices that are equivalent to 23%.

• $$\frac{2}{3}$$  

• 23.0

• 0.23

• $$\frac{23}{100}$$  

• 230

​Solving percent questions:

​Since fractions can be written out of 100, we can use them in a proportion (two equivalent fractions) to find a missing value.

​part

​whole

​percent

​100

​=

​Solving percent questions:

​Since fractions can be written out of 100, we can use them in a proportion (two equivalent fractions) to find a missing value.

​1. What is 30% of 20?​

​2. What is 48% of 302?

​

​

​part

​whole

​percent

​100

​=