Lesson 9
Addition With a Ten
Lesson Purpose
The purpose of this lesson is for students to deepen their understanding that teen numbers are composed of a ten and some ones, and to find the value that makes an addition equation true when one addend is 10.
Lesson Narrative
This lesson builds on the previous lesson in which students composed teen numbers using a ten and some ones. Students move from using connecting cube towers to filledin 10frames to represent teen numbers. Students also relate their composition work and the relationship between addition and subtraction to find values that make equations true.
Students continue using double 10frames throughout the unit. Consider making copies on card stock so they can be used repeatedly.
 Representation
 MLR8
Learning Goals
Teacher Facing
 Compose and decompose teen numbers into 1 ten and some number of ones.
 Find the value that makes an addition equation true, where one addend is 10.
Student Facing
 Let's use a ten to make teen numbers.
Required Materials
Materials to Gather
Materials to Copy
 Double 10Frame  Standard
 Number Cards 1120
Required Preparation
Activity 1:
 Create a set of Number Cards (1120) from the blackline master for each group of 2.
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
What methods are students using when they build teen numbers: concrete objects on a 10frame, drawings, numbers? How do these methods reflect their developing understanding of the unit ten?
Print Formatted Materials
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Additional Resources
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