Lesson 10
Addition and Subtraction with a Ten
Lesson Purpose
The purpose of this lesson is for students to find the value that makes an equation true when one value is a teen number and one is a ten.
Lesson Narrative
In the previous lesson, students found the value that made addition equations true when one addend was 10. In this lesson, students find the missing value in story problems and addition and subtraction equations. They may find the missing value in any way that makes sense to them. In the syntheses, students discuss how the relationship between addition and subtraction is helpful when finding missing values.
 Action and Expression
 MLR6
Learning Goals
Teacher Facing
 Find the value that makes an equation true where the total is a teen number.
 Use the relationship between addition and subtraction to find missing values.
Student Facing
 Let's add and subtract with teen numbers.
Required Materials
Materials to Gather
Required Preparation
CCSS Standards
Addressing
Lesson Timeline
Warmup  10 min 
Activity 1  20 min 
Activity 2  15 min 
Lesson Synthesis  10 min 
Cooldown  5 min 
Teacher Reflection Questions
How did the student work you selected impact the direction of the discussion? What student work might you pick next time if you taught the lesson again?
Print Formatted Materials
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Additional Resources
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