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K-5 Grade 3 Unit 3 Lesson 18

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Lesson 18

Warm-up Activity 1 Activity 2

Unit 3, Lesson 18

Diagrams and Equations for Word Problems

Grade 3

Warm-up

What do you notice? What do you wonder?

<p>Diagram. One rectangle split into 2 parts. Total length, question mark. One part labeled 142, the other part labeled 20.</p> — A

<p>Diagram. One rectangle split into 4 parts. Each part labeled 5. Total length, question mark.</p> — B

Diagram. One rectangle split into 5 parts. Total length, question mark. One part labeled 142, the other four parts all labeled 5. — C

Activity 1

Your teacher will give you a set of cards.

Match each situation to a diagram or an equation. Some situations will match a diagram and an equation. Be ready to explain your reasoning.

Activity 2

Your teacher will assign a problem to your group. Work together to solve your assigned problem.
Create a poster of your group’s solution. Organize your work so that it can be followed by others.
As you visit other groups' posters, consider how each answer makes sense.

Choose 1 poster and make a comment on the solution. Write on your sticky note how you know the answer makes sense.