Lesson 19
Find the Number that Makes 10 (optional)
Lesson Purpose
Lesson Narrative
Students have access to tools used throughout the year, including twocolor counters, connecting cubes, fingers, 10frames, and bead tools, to help them find the number that makes 10. With repeated experience, students may know some of the numbers needed to make 10 by memory, such as 5 and 5 or 9 and 1. Students fill in equations to represent these compositions and decompositions of 10. This lesson is optional because the standards do not require students to fill in equations with one missing addend in kindergarten.
If students need additional support with the concepts in this lesson, refer back to Unit 5, Section C in the curriculum materials.
 Engagement
 MLR8
Learning Goals
Teacher Facing
 Fill in equations to represent compositions and decompositions of 10.
 Find the number that makes 10 when added to a given number.
Student Facing
 Let’s add 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.
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  15 min 
Activity 2  10 min 
Activity 3  20 min 
Lesson Synthesis  10 min 
Cooldown  0 min 
Teacher Reflection Questions
Print Formatted Materials
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Additional Resources
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