Lesson 9
Expressions and Equations
Lesson Purpose
The purpose of this lesson is for students to make sense of expressions and equations that represent numbers 11–19.
Lesson Narrative
Students connect their understanding of numbers 11–19 as ten ones and some more ones to expressions (10 + _____.) Then, they match equations to 10-frame representations of teen numbers.
- Engagement
- MLR8
Learning Goals
Teacher Facing
- Make sense of expressions and equations that represent numbers 11–19.
Student Facing
- Let’s show numbers 11–19 in different ways.
Required Materials
Materials to Gather
Materials to Copy
- Make or Break Apart Numbers Stage 2 Recording Sheet
- Make or Break Apart Numbers Stage 2 Number Mat 11-19
- Numbers and Expressions Cards
- Make or Break Apart Numbers Stage 2 Gameboards
Required Preparation
Activity 1:
- Create a set of cards from the blackline master for each group of 4.
Activity 3:
Gather materials from:
- Bingo, Stages 1-4
- Number Race, Stages 1 and 2
- Grab and Count, Stage 1
- Tower Build, Stages 1 and 2
CCSS Standards
Addressing
Lesson Timeline
| Warm-up | 10 min |
| Activity 1 | 15 min |
| Activity 2 | 10 min |
| Activity 3 | 20 min |
| Lesson Synthesis | 5 min |
| Cool-down | 0 min |
Teacher Reflection Questions
As students worked in their small groups today, whose ideas were heard, valued, and accepted? How can you adjust the group structure tomorrow to ensure each student’s ideas are a part of the collective learning?