Ratio & Proportions

Ratio & Proportions

Multiple Choice

Solve the proportion.

 $\frac{2}{5}=\frac{x}{12}$  

• x = 2

• x = 4.8

• x = 24
  

• x =6.3

Multiple Choice

A satellite is 18 meters wide. A model of it was built with a scale of 1 centimeter : 3 meters. How many centimeters is the model?

• 6 meters

• 6 centimeters

• 54 meters

• 54 centimeters

Setting Up Proportions

• Match Units Together

• There are multiple ways to setup, so be CONSISTENT!

• For Example,

• 1 cup of rice, needs 2.25 cups of water

• If I only have 0.75 cups of rice, how much water will I need?

Book Club Reads!

• Our First Book!

• 180 pgs

• Reading plan was 25pgs per 1 month

• How long will it take us to read the book?

Next Read!

• My next book club read!

• 221 pages

• Each participant will read 18 pgs every 2 weeks.

• How long will it take to read the book?

Multiple Choice

The average rate of hair growth is 2.5 centimeters every 2 months. At that rate, how many months will it take to grow 22.5 centimeters of hair? Which setup is appropriate to solve the proportion?

• $\frac{1\ months}{2.5\ centi}=\frac{22.5centi}{x}$

• $\frac{2.5\ centi}{2\ months}=\frac{22.5\ centi}{x}$

• $\frac{22.5\ centi}{2\ months}=\frac{x}{2.5\ centi}$

• $\frac{1}{2.5\ centi}=\frac{x}{22.5\ centi}$

Multiple Choice

The average rate of hair growth is 2.5 centimeters every 2 months. At that rate, how many months will it take to grow 22.5 centimeters of hair?

• 9 months

• 11.25 months

• 18 months

• 28 months