Lesson 5
Subtract with Objects
Lesson Purpose
Lesson Narrative
In previous lessons, students represented addition by putting 2 groups of objects together or adding more objects. In this lesson, students represent the action of subtraction with objects. Students take away a number of objects and determine the number of objects remaining. The language of “take away” and “subtract” is introduced by the teacher throughout the lesson. Students are not expected to produce this language in this lesson. The notation “_____ take away _____” is also introduced. Students need time to see and hear the teacher use this language before they can understand expressions “_____ - _____”, which are introduced in a later section.
- Representation
- MLR8
Learning Goals
Teacher Facing
- Use objects to show the action of subtraction.
Student Facing
- Let’s use counters to subtract.
Required Materials
Materials to Gather
Materials to Copy
- Number Mat 1–5
Required Preparation
Activity 2:
- Each group of 2 needs 1 connecting cube.
Activity 3:
- Gather materials from:
- 5-Frames, Stages 1 and 2
- Roll and Add, Stage 1
- Math Libs, Stage 1
- Match Mine, Stage 1
Lesson Timeline
| Warm-up | 10 min |
| Activity 1 | 10 min |
| Activity 2 | 10 min |
| Activity 3 | 25 min |
| Lesson Synthesis | 5 min |
| Cool-down | 0 min |