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

Lesson Timeline

 Warm-up 10 min Activity 1 20 min Activity 2 15 min Lesson Synthesis 10 min Cool-down 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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