# Lesson 7

Shake and Spill

### Lesson Purpose

The purpose of this lesson is for students to make sense of, represent, and solve Put Together/Take Apart, Both Addends Unknown story problems. Students write equations and explain how they relate to the story problems.

### Lesson Narrative

This work builds on work from kindergarten when students composed and decomposed numbers in more than one way and represented these decompositions with their fingers, connecting cubes, two-color counters, drawings, and expressions. Students revisit Put Together/Take Apart, Both Addends Unknown problems through a game in which they decompose a total into two addends. Students record the decomposition with an equation. In Activity 2, students solve and represent story problems based on the context of the game, and explore the different places the total can be represented in an equation, which deepens understanding of the meaning of the equal sign.
• Engagement
• MLR8

### Learning Goals

Teacher Facing

• Solve Put Together/Take Apart, Both Addends Unknown story problems in a way that makes sense to them.
• Write an equation and explain why it matches a story problem.

### Student Facing

• Let’s think about breaking numbers apart and putting them back together.

### Required Materials

Materials to Gather

Materials to Copy

• Shake and Spill Stage 3 Recording Sheet Grade 1

### Required Preparation

Activity 1:

• Each group of 2 needs 10 two-color counters and a cup (at least 8 oz).

Building Towards

### Lesson Timeline

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

### Teacher Reflection Questions

What evidence have students given that they understand the meaning of the equal sign? Why is it important for students to understand the meaning of the equal sign before solving Addend Unknown problems in the upcoming lessons?

### Print Formatted Materials

For access, consult one of our IM Certified Partners.