Unit 8, Lesson 18
All the Ways to Make 10 (Optional)
Kindergarten
Preparation
Lesson Purpose
The purpose of this lesson is for students to find all of the compositions and decompositions of 10 in the context of a story problem.
Lesson Narrative
This lesson is optional, because the standards do not require students to find all solutions for Put Together/Take Apart, Both Addends Unknown story problems. This lesson does provide students more practice with Put Together/Take Apart, Both Addends Unknown story problems and compositions and decompositions of 10.
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 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 solutions.
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
- Choose strategies to solve related Put Together, Result Unknown and Put Together/Take Apart, Both Addends Unknown problems.
- Represent all the ways to compose and decompose 10 to solve a Put Together/Take Apart, Both Addends Unknown problem.
- Let’s find all the ways to make 10.
Required Materials
Activity 3
Required Preparation
Activity 1
- Students can use their bead tools from a previous lesson.
Activity 2
- Students can use their bead tools from a previous lesson.
- Create a chart displaying solutions to be used during the Lesson Synthesis.
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Activity 3
- Gather materials from:
- Shake and Spill
- Number Race
- Grab and Count
- What's Behind My Back?
- Pattern Blocks
Suggested Centers
NoneTeacher Reflection Questions
As students worked together today, where did you see evidence of the mathematical community established over the course of the school year?
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