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Home > MC2 > Chapter 2 > Lesson 2.3.1 > Problem 2-97


Zac is making cookies, but he does not have enough flour to make a full recipe. The full recipe calls for cup of brown sugar.

If Zac is making of the full recipe, how much brown sugar should he use?

  1. Represent the cup of brown sugar with a diagram.

  2. Represent the portion of brown sugar that Zac needs if he makes only of the recipe.

  3. What math operation should Zac use to find the amount of brown sugar he needs? Write an expression and find a solution.

First draw a rectangle to represent a full cup of brown sugar. Now try to solve the problem with this information.

 is the same thing as one-thirds.

How can you subdivide your shaded diagram from part (a) into fifths (5 equal parts)?

Which part of the sugar is 3 of the fifths?

One way this can be represented is...

Label the portion of brown sugar Zac needs.

What fraction of a cup will Zac use? What operation with  and  will get that answer?