Unit 3, Lesson 5
Find the Difference
Grade 1
Preparation
Lesson Purpose
The purpose of this lesson is for students to develop fluency with subtraction within 10, using the relationship between addition and subtraction.
Lesson Narrative
In previous lessons, students found the value of sums within 10. In this lesson, students find differences within 10. They may take away, count up, or use addition facts to help them find the value of the difference between two numbers. The relationship between addition and subtraction is the focus of the Syntheses throughout the lesson.
- Engagement
None
- Explain (orally) strategies for subtracting within 10, including those based on using known sums or differences.
- Interpret (orally and using other representations) subtraction strategies based on the relationship between addition and subtraction.
- Let’s find differences within 10.
Required Materials
Activity 1
Activity 2
Activity 3
Required Preparation
None
Suggested Centers
NoneTeacher Reflection Questions
Many students prefer addition to subtraction. How do the activities in this lesson help students see that addition and subtraction are related and that addition can be used to find the difference between two numbers?
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