Unit 1, Lesson 5
Explore Addition and Subtraction
Grade 1
Preparation
Lesson Narrative
Students add and subtract in a way that makes sense to them as they learn a new stage of the Check It Off center. Then students choose from other center activities introduced in previous lessons. Students may use their knowledge of the counting sequence, count all, count on, or count back to find the sum or difference. This lesson provides an opportunity to collect formative assessment data on how students are developing methods for adding and subtracting within 10 that build toward fluency.
Math Community
Tell students they will have a chance to revise their math community ideas at the end of this lesson. As students work today, they should think about norms that may be missing from the current list.
- Action and Expression
- MLR8
- Comprehend (in spoken language) the phrase “value of a difference” refers to the result when one number is subtracted from another.
- Represent differences with expressions and find the value of differences within 10.
- Let’s add and subtract.
Required Materials
Activity 2
Required Preparation
- Each group of 2 needs a set of Number Cards 0–10.
- Gather materials from previous centers:
- Counting Collections, Stage 1
- Number Race, Stage 3
- Check It Off, Stages 1 and 2
- Five in a Row: Addition and Subtraction, Stages 1 and 2
Suggested Centers
NoneTeacher Reflection Questions
Reflect on how comfortable your students are asking questions of you and of each other. What can you do to encourage students to ask questions?