Lesson 9 You Ate the Whole Thing

    • Let’s talk about the whole.

Warm-up Number Talk: What’s the Sum?

Find the value of each expression mentally. 

Activity 1 Pizza to Share

Problem 1

Clare’s friends were going to share a pizza. The image shows how they cut the pizza.

Pizza cut into thirds.

Claire ate 3 slices and her friends got upset with her.

  1. Why are her friends upset?

  2. How many thirds did Clare eat?

  3. How much of the pizza was left?

Problem 2

Pizza Parts

Pizza cut into thirds.

Group

Priya

Han

Diego

  1. Priya will eat of the pizza.

  2. Together they will eat of the pizza.

Problem 3

Pizza Parts

Pizza cut into halves.

Group

Jada

Mai

  1. Each girl will eat of the pizza.

  2. Together they will eat of the pizza.

Problem 4

Pizza Parts

Pizza cut into fourths.

Group

Elena

Tyler

Lin

Kiran

  1. How much pizza will each child eat?

  2. How much pizza will they eat in all?

Activity 2 Equal Shares of the Pie

Problem 1

Match each story with the image that it represents.

  1. Noah ate most of the pie. He left a quarter of the pie for Diego.

  2. Lin gave away a half of her pie and kept a half of the pie for herself.

  3. Tyler cut a pie into four equal pieces. He ate a quarter of the pie.

  4. Mai sliced the pie to share it equally with Clare and Priya.

  1. Half a pie.
  2. One quarter of a pie.
  3. Pie cut into thirds.

Problem 2

In story D, Mai sliced the pie to share it equally with Clare and Priya.

  1. How much of the pie will they each get?

  2. How much of the pie will they eat in all?

Problem 3

Now you try.

    • Partition the circle into four equal pieces.

    • Shade in a quarter of the circle red.

    • Shade in the rest of the circle blue.

    Circle.

    How much of the circle is shaded?

    • Partition the circle into 2 equal pieces.

    • Shade one half of the circle blue.

    • Color the other piece yellow.

    Circle.

    How much of the circle is yellow?

    How much of the circle is shaded?

Practice Problem

Problem 1

  1. Partition the circle into 4 equal parts.

  2. Shade 3 parts blue and one part red.

  3. How much of the circle is shaded?

Circle.