Lesson 9
Suma con una decena
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 filled-in 10-frames 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 10-frames 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
- Usemos una decena para formar números del 11 al 19.
Required Materials
Materials to Gather
Materials to Copy
- Number Cards 11-20
- Double 10-Frame - Standard
Required Preparation
Activity 1:
- Create a set of Number Cards (11-20) from the blackline master for each group of 2.
CCSS Standards
Addressing
Lesson Timeline
| Warm-up | 10 min |
| Activity 1 | 20 min |
| Activity 2 | 15 min |
| Lesson Synthesis | 10 min |
| Cool-down | 5 min |
Teacher Reflection Questions
What methods are students using when they build teen numbers: concrete objects on a 10-frame, drawings, numbers? How do these methods reflect their developing understanding of the unit ten?
Print Formatted Materials
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| Student Task Statements | docx | |
| Lesson Cover Page | docx | |
| Cool Down | Log In | |
| Teacher Guide | Log In | |
| Teacher Presentation Materials | docx | |
| Blackline Masters | zip |