Lesson 18
All the Ways to Make 10 (optional)
Lesson Purpose
Lesson Narrative
In a previous unit, students found more than one solution to Put Together/Take Apart, Both Addends Unknown story problems. In a previous lesson, students used objects, images, and equations to make and break apart 10.
In this lesson, students solve a Put Together/Take Apart, Both Addends Unknown story problem with a total of 10. Then students work together to find all of the solutions to a Put Together/Take Apart, Both Addends Unknown story problem with a total of 10. Students may notice patterns in the solutions, such as that when one addend increases the other addend decreases, to help them determine if they have found all of the solutions. This lesson is optional because the standards do not require students to find all of the solutions for Put Together/Take Apart, Both Addends Unknown story problems.
If students need additional support with the concepts in this lesson, refer back to Unit 5, Section C in the curriculum materials.
 Action and Expression
 MLR8
Learning Goals
Teacher Facing
 Compose and decompose 10 in multiple ways.
Student Facing
 Let’s find all the ways to make 10.
Required Materials
Required Preparation
Activity 1:
 Students can use their bead tool from a previous lesson.
Activity 2:
 Students can use their bead tool from a previous lesson.
 Create a chart displaying solutions to be used during the lesson synthesis.
pigeons in the
fountainpigeons on the
bench9
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Activity 3:
 Gather materials from:
 Shake and Spill
 Number Race
 Grab and Count
 What's Behind My Back?
 Pattern Blocks
Lesson Timeline
Warmup  10 min 
Activity 1  10 min 
Activity 2  10 min 
Activity 3  20 min 
Lesson Synthesis  10 min 
Cooldown  5 min 
Teacher Reflection Questions
Print Formatted Materials
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Additional Resources
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