# Lesson 13

Formemos 10

### Lesson Purpose

The purpose of this lesson is for students to find the number that makes 10 when added to a given number.

### Lesson Narrative

In previous lessons, students used 10-frames and fingers to compose and decompose 10 in more than one way. In the previous lesson, students used the structure of a partially filled in 10-frame to determine how many more needed to be added to make 10. In this lesson, students develop strategies for finding the number that makes 10 when added to a given number.

While students may use any method that makes sense to them to find the given number, using 10-frames and fingers is highlighted because the structure allows students to see how many more are needed to make 10. As they choose a strategy, they will be making use of appropriate tools strategically (MP5).

• Engagement
• MLR8

### Learning Goals

Teacher Facing

• Fill in equations to represent compositions and decompositions of 10.
• Find the number that makes 10 when added to a given number.

• Formemos 10.

### Required Materials

Materials to Gather

Materials to Copy

• 10-Frame Standard
• Number Mat 1–9
• Math Fingers Stage 4 Recording Sheet

### Required Preparation

Activity 3:

• Gather materials from:
• Math Fingers, Stages 1-4
• Shake and Spill, Stages 1-3
• Counting Collections, Stage 1
• Roll and Add, Stages 1 and 2

Building Towards

### Lesson Timeline

 Warm-up 10 min Activity 1 10 min Activity 2 15 min Activity 3 15 min Lesson Synthesis 5 min Cool-down 5 min

### Teacher Reflection Questions

What connections did students make between the different strategies shared? What questions did you ask to help make the connections more visible?