# Lesson 12

Decimal Game Day

### Lesson Purpose

The purpose of this lesson is for students to practice adding and subtracting decimals.

### Lesson Narrative

In a previous unit, students learned how to add and subtract decimals.

In this lesson, students play games where they practice adding and subtracting decimals. The first game resembles the games students played in the previous two lessons. The second game has more complex rules but a simpler goal which is to make the largest number possible and then continue to add those numbers until reaching a given goal.

• Action and Expression
• MLR8

### Learning Goals

Teacher Facing

• Add, subtract, multiply, and divide decimals to hundredths.

### Student Facing

• Let’s play some games and practice adding and subtracting decimals.

### Required Materials

Materials to Gather

### Required Preparation

Activity 1:

• Each group of 2 needs a number cube.

Activity 2:

• Each group of 2 needs a paper clip.

Addressing

### Lesson Timeline

 Warm-up 10 min Activity 1 15 min Activity 2 20 min Lesson Synthesis 10 min Cool-down 5 min

### Teacher Reflection Questions

When did students listen to one another’s ideas today in class? What norms would help each student better attend to their classmates' ideas in future lessons?

### Print Formatted Materials

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### Additional Resources

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