Lesson 7
Does it Make a New Ten?
Lesson Purpose
The purpose of this lesson is for students to add onedigit numbers and twodigit numbers, and recognize when a new ten will be composed. They write equations to represent their addition methods.
Lesson Narrative
In previous lessons, students added onedigit and twodigit numbers with composing a ten. They discussed methods that involved counting on, adding ones and ones then tens, and decomposing the onedigit number to make a new ten with the twodigit number.
In this lesson, students consider when a new ten will be composed before they find the value of a sum. When students recognize that they can compose a new unit of ten whenever the ones digits make 10 or more ones, they look for and make sense of the baseten structure of numbers (MP7). Students write equations that represent their thinking.
 Action and Expression
 MLR6
Learning Goals
Teacher Facing
 Add a onedigit and a twodigit number and recognize when a new ten will be composed.
 Write equations that represent addition methods.
Student Facing
 Let’s add onedigit and twodigit numbers and write equations.
Required Materials
Materials to Gather
Required Preparation
CCSS Standards
Addressing
Lesson Timeline
Warmup  10 min 
Activity 1  15 min 
Activity 2  20 min 
Lesson Synthesis  10 min 
Cooldown  5 min 
Teacher Reflection Questions
At what points during the lesson did you learn the most about your students’ thinking? How did you use what you learned during this lesson and how will you use what you learned in tomorrow’s lesson?
Print Formatted Materials
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Additional Resources
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