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# Creating Multiple Proportions - PowerPoint PPT Presentation

Creating Multiple Proportions. Sunday, July 13, 2014 We are learning to…use proportional reasoning to solve problem situations. Vocabulary Review:. What is a ratio? A comparison of two quantities, usually written in the form of a fraction in simplest form. What is a proportion?

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### Creating Multiple Proportions

Sunday, July 13, 2014

We are learning to…use proportional reasoning to solve problem situations.

• What is a ratio?

• A comparison of two quantities, usually written in the form of a fraction in simplest form.

• What is a proportion?

• Two ratios set equal to one another.

• Ted eats 6 pancakes in 2 days. How many days will it take Ted to eat 15 pancakes?

Table: Proportion:

(15)

(15)

• Insert that missing value into your table.

“Prove that you have created equal ratios.”

“Is there only one proportion that you could have created to solve this problem?”

“What about creating proportions from data vertically in the table?”

This is one proportion!

Solve this proportion!

(2)

(2)

• We know we can make proportions horizontally and vertically using the table…whatabout diagonally?

We cannot use these ratios to help us solve because they do not create equal ratios (proportions).

1. Do these make equal ratios?

2. Can we make a true proportion?

Why does this comparison not give us a proportion?

3. Can we use this to help us find a solution? Why or why not?

• Practice:

• Mr. Cain sells 4 candy bars every 5 hours. How long will it take him to sell 16 candy bars?