Lesson 1 One Piece of One Part

    • Let’s solve problems about unit fractions.

Warm-up Notice and Wonder: Baked Macaroni and Cheese

What do you notice? What do you wonder?

Photograph. Mac and cheese in pan with spatula. Less than 1 half remains. 

Activity 1 Of What?

At a family dinner, a pan of macaroni and cheese is full. Lin eats of the remaining macaroni and cheese in the pan.

  1. Draw a diagram to represent the situation.

  2. Explain or show how you know your diagram represents the situation.

Activity 2 The Same, but Different

  1. Explain or show how each diagram represents of of a pan of macaroni and cheese.

    Diagram. Half shaded. 1 fourth of the half shaded darker.
    Diagram. Half shaded. 1 fourth of the half shaded darker.

  2. Use the diagrams to show that of is of the whole pan.

Practice Problem

Problem 1

  1. Shade of of the square.

    Diagram, square. Length and width, 1. 

  2. Explain where you see of in your drawing.