1. Ratio & Unit Rate
Math 7
Ms. Harrison

2. A ratio is a comparison of two numbers using DIVISION
A ratio can be written three ways:
3:5 3/5 3 to 5
BACK

3. Ratios are often expressed as fractions in simplest or as a decimal.

4. A ratio is the comparison of two numbers with the same units.
What three DIFFERENT ratios can we form from the tiles above comparing the light blue tiles?

5. Create as many ratios as possible
Create as many ratios as possible. Write each ratio three different ways.

6. Simplest Form Write the ratio 50 to 300 in simplest form.
What did you do to REDUCE the fraction?

7. Simplest Form
Write the ratio 60¢ per dozen in simplest form.

8. Look over the ratios you have written.
Is there another way that you can write those ratios?
The ratio illustrated here is four filled cells to ten total cells.
The ratio shown here is two filled cells to five total cells.
What do you notice about these two ratios? How can you prove your answer?

9. Unit Rate “How much for just 1?”
To find the Unit Rate, you would find the cost or amount for 1 or the rate when the denominator is 1.
“How much for just 1?”

10. Unit Rate
If it costs $78 for 13 sandwiches, What is the unit rate?

11. Find the unit rate to find the better buy.
COMPARING UNIT RATES
Find the unit rate to find the better buy.
The cost of a 12-ounce box of
Cheerios is $3.29. Publix brand
Cheerios cost $4.89 for an 18-
ounce box. Which is the better buy?

12. Mile per Gallon
M.P.G. stands for miles per gallon and is usually used for gas mileage in cars.

13. Unit Rate
If it takes 10 gallons to drive 250 miles, What is the unit rate or m.p.g.?

14. 250 miles = 25 miles per gallon 10 gallons is the UNIT RATE.
Finding Unit Rate:
250 miles = 25 miles per gallon
10 gallons is the UNIT RATE.

15. Now you try it!