Unit 3, Lesson 25
How Do You Want to Subtract?
Grade 1
Preparation
Lesson Purpose
The purpose of this lesson is for students to use subtraction methods flexibly to find differences.
Lesson Narrative
Students apply their learning from the unit to flexibly use methods to subtract within 20. There is not one correct method to use, as it is based on each student’s understanding of the concepts of subtraction, their known facts, and the numbers in the problem. It is helpful for students to listen to and make sense of others’ reasoning about which method they used (MP3). In the first activity, students find differences in given expressions. In the second activity, students apply subtraction methods as they solve story problems with the unknown in all positions.
- Engagement
- MLR8
- Explain (orally) strategies for solving Add To and Take From story problems within 20.
- Explain (orally) strategies for subtracting and how a strategy was chosen based on the numbers in the expression.
- Let’s use subtraction methods that work for the numbers in a problem.
Required Materials
Required Preparation
None
Suggested Centers
NoneTeacher Reflection Questions
How did your students represent their work today? How might you support them in creating more efficient representations?
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