S

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5 red pixie sticks, 3 orange pixie sticks, 2 purple pixie

sticks

1)red : purple 2) red: green

3) purple:total 4) orange:purple

5) Orange and red: total

6) Purple: other colors

• ratio table

• equivalent ratio

• scaling

• Use ratio tables to represent and solve problems involving equivalent ratios.

Equivalent Ratios of Larger Quantities

BEANS A recipe calls for 5 cups of water for each cup of pinto beans. Use the ratio table to find how many cups of water should be used for 4 cups of pinto beans.

Method 1 Find a pattern and extend it.

For 2 cups of beans, you would need a total of 5 + 5 or 10 cups of water.

Equivalent Ratios of Larger Quantities

Continue this pattern until you reach 4 cups.

Method 2 Multiply each quantity by the samenumber.

Since 1 × 4 = 4, multiply each quantity by 4.

Equivalent Ratios of Larger Quantities

Answer: So, you would need 20 cups of water for 4 cups of beans.

1. A

2. B

3. C

4. D

A. 11 cups

B. 13 cups

C. 15 cups

D. 17 cups

PUNCH A recipe for punch calls for 3 cups of juice for every cup of soda. Use the ratio table to find how many cups of juice should be used for 5 cups of soda.

SMART Response QuestionTo set the properties right click and selectSMART Response Question Object->Properties...

Equivalent Ratios of Smaller Quantities

SPIDERS Texas has over 900 species of spiders. Use the ratio table to find how many legs a spider has.

Divide each quantity by one or more common factors until you reach a quantity of 1 spider.

Answer: So, a spider has 8 legs.

1. A

2. B

3. C

4. D

A. 3 windows

B. 4 windows

C. 5 windows

D. 6 windows

WINDOWS Each apartment in Jarome’s apartment building has the same number of windows. Use the ratio table to find how many windows each apartment in the building has.

SMART Response QuestionTo set the properties right click and selectSMART Response Question Object->Properties...

Use Scaling

CLOTHING Coco used 12 yards of fabric to make 9 blouses. Use the ratio table to find the number of blouses she could make with 20 yards of fabric.

There is no whole number by which you can multiply 12 to get 20. So, scale back to 4 and then scale forward to 20.

Use Scaling

Divide each quantity by a common factor, 3. Then, since 4 × 5 = 20, multiply each quantity by 5.

Answer: So, Coco could make 15 blouses with 20 yards of fabric.

1. A

2. B

3. C

4. D

A. 12 bottles

B. 14 bottles

C. 15 bottles

D. 18 bottles

PAINT Mrs. Wallace ordered 8 bottles of paint for 18 students. Use the ratio table to find the number of bottles of paint she would need to order for 27 students.

SMART Response QuestionTo set the properties right click and selectSMART Response Question Object->Properties...

PACKAGING It takes a worker 70 minutes to pack 120 cartons of books. The worker has 14 minutes of work left. Use a ratio table to find how many cartons of books the worker can pack in 14 minutes.

Set up a ratio table.

Use a Ratio Table

Label the rows with the two quantities being compared. Then fill in what is given.

Use a Ratio Table

Answer: The worker can pack 24 cartons of books in 14 minutes.

Divide each quantity by a common factor, 10. Then, since 7 × 2 = 14, multiply each quantity by 2.

Use scaling to find the desired quantity.

1. A

2. B

3. C

4. D

A. 8 cards

B. 10 cards

C. 12 cards

D. 14 cards

CARDS Maya wrote 18 thank you cards in 15 minutes. She has 10 minutes to work on her thank you cards before tennis practice. Use a ratio table to find how many cards she can write in 10 minutes.

SMART Response QuestionTo set the properties right click and selectSMART Response Question Object->Properties...

End of the Lesson

1) Worksheet Practice on Ratio Tables

2) If you finish you can start on textbook homework

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