Cooking with Fractions

Cooking with Fractions

Make Apricot Bread

Opening

Make Apricot Bread

Here is the list of ingredients for a recipe Denzel wants to make.

Apricot Bread

1 cup chopped almonds
112 cups dried apricots
114 cups water
12 cup honey
212 cups flour
2 tablespoons butter
2 teaspoons baking powder
1 egg
1 teaspoon vanilla
1 teaspoon salt

As Denzel is about to measure out the ingredients, he realizes that the only size measuring cup he has is a 14-cup measuring cup. The first five ingredients are given in cups.

Discuss:

  • Can Denzel measure the first five ingredients using only his 14-cup measuring cup?

Math Mission

Opening

Explore how to measure the ingredients for a recipe using only a 14-cup measuring cup.

How Much of Each Ingredient?

Work Time

How Much of Each Ingredient?

Determine how many times Denzel needs to fill his 14-cup measuring cup to get the right amount of each of the first five ingredients.

  • Rewrite the recipe so that it shows how many 14-cups are needed of each of the ingredients.
    • 1 cup chopped almonds = [   ] 14-cups
    • 112 cups dried apricots = [   ] 14-cups
    • 114 cups water = [   ] 14-cups
    • 12 cup honey = [   ] 14-cups
    • 212 cups flour = [   ] 14-cups
  • Discuss your answers with your partner.

Try making a diagram to represent the amount of each ingredient. How many 1/4 -cups does your diagram represent?

Prepare a Presentation

Work Time

Prepare a Presentation

  • Present your rewritten recipe.
  • Describe the strategy you used to rewrite the recipe so that it could be followed using only a 14-cup measuring cup.

Challenge Problem

Suppose that Denzel decides to make only half of the recipe.

Remember the recipe called for:

  • 12 cup of honey
  • 212 cups of flour

How much honey will he need? How much flour?

Think about what you did to solve the problem. Did you use the same approach for each ingredient?

Make Connections

Performance Task

Ways of Thinking: Make Connections

Take notes about your classmates’ strategies for converting the quantities in the recipe.

As your classmates present, ask questions such as:

  • Can you explain why your strategy makes sense?
  • Where can I see the total amount of the ingredient in your model?
  • Where can I see the 1 4 -cups in your model?
  • How are your representations for the different ingredients alike? How are they different?
  • How is your strategy similar to other strategies that your classmates presented? How is it different?

Reflect On Your Work

Work Time

Reflection

Write a reflection about the ideas discussed in class today. Use the sentence starter below if you find it to be helpful.

Something I wonder about dividing by a fraction is …