Unit 8, Lesson 17
Make and Break Apart 10 (Optional)
Kindergarten
Preparation
Lesson Narrative
This lesson is optional, because it is an opportunity for practice that not all students may need. In a previous unit, students composed and decomposed 10 in multiple ways, using their fingers and 10-frames. This lesson provides additional practice with compositions and decompositions of 10 before students find the number that makes 10 when added to a given number. Students create a tool with 10 beads—5 beads in each of two colors—that can be used in addition to a 10-frame and fingers to show different compositions and decompositions of 10. Students may choose to use this tool throughout the section.
If students need additional support with the concepts in this lesson, refer back to Unit 5, Section C in the curriculum materials.
- Representation
- MLR8
- Use equation frames to generate equations that represent decompositions of 10.
- Use objects to represent different decompositions of 10 written as equations.
- Let’s make and break up groups of 10.
Required Materials
Activity 1
Activity 2
Activity 3
Required Preparation
- Each student needs a chenille stem and 10 beads—5 beads each of two different colors.
- Each student needs the bead tool that they created in the previous activity.
- Gather materials from:
- Shake and Spill
- Number Race
- Grab and Count
- What's Behind My Back?
- Pattern Blocks
Suggested Centers
NoneTeacher Reflection Questions
How is the bead tool that students made in this lesson similar to and different from other tools that they have used? How do you anticipate that students will use the bead tools in future lessons?