Unit 8, Lesson 2
Relate Addition and Subtraction
Grade 1
Preparation
Lesson Purpose
The purpose of this lesson is for students to use the relationship between addition and subtraction to fluently add and subtract within 10.
Lesson Narrative
Throughout the year, students have been building fluency with addition and subtraction within 10. Students often find subtraction more difficult than addition because it does not relate to counting as clearly. The purpose of this lesson is to highlight and have students utilize the relationship between addition and subtraction (MP7) and for students to practice differences within 10 that they do not yet know with fluency.
If students need additional support with the concepts in this lesson, refer back to Unit 3, Section A in the curriculum materials.
- Representation
- MLR2
- Explain (orally) how to determine the values that make equations within 10 true, including using the relationship between addition and subtraction.
- Identify differences within 10 that are known and not yet known and explain (orally) how to use a related sum to determine the value of differences that are not yet known.
Required Preparation
Activity 1
- Create a tower of connecting cubes with 4 cubes of one color and 3 cubes of another color.
Suggested Centers
NoneTeacher Reflection Questions
Students will continue to use the relationship between addition and subtraction to add and subtract in future grades. In what ways did you see students use their understanding of the relationship between addition and subtraction during today's lesson? How can you continue to foster this understanding in upcoming lessons?
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