Unit 3, Lesson 9
Suma con una decena
Grado 1
Preparation
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
- 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?