Unit 3, Lesson 9
Addition with a Ten
Grade 1
Preparation
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 or laminating so they can be used repeatedly.
- Representation
- MLR8
- Comprehend (orally) the term “teen number” refers to a number with one ten and between one and nine ones.
- Find the number that makes an addition equation true, where one addend is 10.
- Represent teen numbers with 10-frames, 2-digit numbers, and equations.
Required Materials
Activity 1
Required Preparation
Activity 1
- Create a set of number cards from the blackline master for each group of 2.
Suggested Centers
NoneTeacher Reflection Questions
What methods are students using when they build teen numbers: concrete objects on a 10-frame, drawings, or numbers? How do these methods reflect their developing an understanding of the unit ten?
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