Unit 3, Lesson 12
Subtract from a Teen Number
Grade 1
Preparation
Lesson Purpose
The purpose of this lesson is for students to add and subtract within 20 without composing or decomposing a ten.
Lesson Narrative
In previous lessons, students learned the 1
- Explain (orally and with words or other representations) strategies for finding the number that makes addition and subtraction equations within 20 true.
- Explain (orally) strategies for solving a Take From, Result Unknown problem where a one-digit number is subtracted from a teen number.
- Let’s subtract and add within 20.
Required Materials
Activity 3
Required Preparation
Activity 3
- Each group of 2 needs 20 two-color counters and a cup (at least 8 oz).
Suggested Centers
NoneTeacher Reflection Questions
What connections did students make between the different methods shared? What questions did you ask to help make the connections more visible?
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