What is best?

20oz popcorn for $4.50 or 32 oz popcorn for $7.00 ?

$4.50 / 20 = $0.225 per oz so $0.23

Here is the Unit Cost:

$7.00 / 32 = $0.21875 per oz so $0.22

So the lowest Unit Price (and the best bargain) is 32oz for $7.00

Bell Work

A ratio is the comparison of two numbers with the same units by division. A ratio may be written in three ways.

3

2 3:2 3 to2

What ratios can we form from the tiles above?

part

whole

whole

part

part

part 12 to 8

20

12

12

20

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

Simplest Form

• Write the ratio 50 to 300 in simplest form.

300

50

6

1

Write the ratio of filled cells to total cells?

The ratio illustrated here is four filled cells to ten total cells.

The ratio shown here is two filled cells to five total cells.

How are they equivalent? 5

2

10

4and

Unit RateTo 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?”

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

12

29.3274.

18

89.4271.

How can you show an infinite number of possible answers?

Egg salad: 2 pound for $6

You can display all the possibilities in a proportional relationship by graphing!

1 pound for $5

2 pounds for $6

20 pounds for $100

1 pound for $3

6 pounds for $18

Let’s Review

Core Lesson

2 pounds for $6Weight

(lb.)Cost ($)

2

4

6

6

12

18

Let’s Review

Core Lesson

Weight (lb.)

Cost ($)

2

4

6

6

12

18

Weight (lb.)

Let’s Review

Core Lesson

Time (hr.)

30 miles in 2 hours

45 miles in 3 hours

15 miles in 1 hour

Let’s ReviewGuided Practice

Graph the proportional relationship “2 pounds of prime rib for $11.”

Weight (lb.)

Weight (lb.)

Cost ($)

112

1 5.504 22

Let’s ReviewGuided Practice

State in words the proportional relationship shown here.(There are many correct answers!)

x

y

Time (min.)

2 feet per min

Let’s ReviewExtension Activities

Graph “a loss of 2 dollars per day.” Discuss why the graph is in the fourth quadrant.

Day

Day $

1

3

5

-2

-6

-10

Let’s Review

Quick Quiz

Graph the proportional relationship “15 miles in 3 hours.”

You Try:

3 6 9 12 15

hours

Let’s Review

Quick Quiz

State in words the proportional relationship shown here.(There are many correct answers!)

Weight (ounces)

You Try

5oz for $2

Skills Check!When you finish turn your paper over and

put it in the corner of your desk. Silent read, work on other homework or practice more problems. No talking.

Practice:

Worksheet