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Number Talk: Adjusting a Factor with Whole Numbers
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Unit 1: Introducing Ratios Lesson 3: Recipes
Salty Water
Here are diagrams representing three mixtures of salty water:
Use the diagrams to complete each statement.
1. Mixture C uses ______ cups of water and ______ teaspoons of salt. The ratio of cups of water to
teaspoons of salt in mixture C is ________.
2. Mixture B uses ______ cups of water and ______ teaspoons of salt. The ratio of cups of water to
teaspoons of salt in mixture B is ________.
3. How would the taste of mixture C compare to the taste of mixture B?
Unit 1: Introducing Ratios Lesson 3: Recipes
Are you ready for more?
Draw a diagram that represents a mixture that is saltier than Mixture B. Explain how you know it
will be saltier.
Unit 1: Introducing Ratios Lesson 3: Recipes
Batches of Cookies
A recipe for one batch of cookies calls for 5 cups of flour and 2 teaspoons of vanilla.
1. Draw a diagram that shows the amount of flour and vanilla needed for two batches of cookies.
2. How many batches can you make with 15 cups of flour and 6 teaspoons of vanilla? Indicate the
additional batches by adding more ingredients to your diagram.
3. How much flour and vanilla would you need for 5 batches of cookies?
Whether the ratio of cups of flour to teaspoons of vanilla is
Unit 1: Introducing Ratios Lesson 3: Recipes
,
, or
, the recipes would
make cookies that taste the same. We call these equivalent ratios.
4. Find another ratio of cups of flour to teaspoons of vanilla that is equivalent to these ratios.
5. How many batches can you make using this new ratio of ingredients?
Unit 1: Introducing Ratios Lesson 3: Recipes
Are you ready for more?
Suppose this cookie recipe also calls for 3 cups of sugar. Draw a diagram that shows the amount
of sugar, flour, and vanilla needed to triple the recipe. Write equivalent ratios that represent the
cups of sugar and the cups of flour for one batch and for three batches.
Unit 1: Introducing Ratios Lesson 3: Recipes