Unit 5, Lesson 7
¿Se forma una nueva decena?
Grado 1
Preparation
Lesson Narrative
In previous lessons, students added one-digit and two-digit numbers with composing a ten. They discussed methods that involved counting on, adding ones and ones then tens, and decomposing the one-digit number to make a new ten with the two-digit 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 base-ten structure of numbers (MP7). Students write equations that represent their thinking.
This lesson has a Student Section Summary.
- Action and Expression
- MLR6
- Create sums that require composing a ten when adding by place and sums that do require composing a ten.
- Explain (orally and with words or other representations) how to determine if a ten will be composed when adding within 100.
- Find the value of sums within 100 and represent addition strategies with equations.
Required Materials
Required Preparation
None
Suggested Centers
NoneTeacher 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?