Unit 8, Lesson 4
Change Unknown Story Problems
Grade 1
Preparation
Lesson Purpose
The purpose of this lesson is for students to solve Add To and Take From, Change Unknown story problems.
Lesson Narrative
In a previous unit, students were introduced to Add To and Take From, Change Unknown story problems and solved these problems in any way that made sense to them. This lesson offers more practice solving these types of problems. Students share different methods and discuss how either addition or subtraction can be used to solve these problems. These discussions help students develop their understanding of how to make sense of and solve these problem types and reinforce their methods for adding and subtracting within 20.
If students need additional support with the concepts in this lesson, refer back to Unit 2, Section A in the curriculum materials.
- Representation
- MLR8
- Explain (orally) strategies for solving Add To and Take From, Change Unknown problems within 20, including using the relationship between addition and subtraction.
Let’s solve story problems.
Required Materials
Required Preparation
None
Suggested Centers
NoneTeacher Reflection Questions
Think about times when students were able to make connections to and build on the ideas of their peers during discussions today. What norms or routines allowed students to engage with other students’ ideas?
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