Unit 3, Lesson 12
Restémosle a un número del 11 al 19
Grado 1
Preparation
Lesson Narrative
In previous lessons, students learned the 1 structure of teen numbers and considered the relationship between addition and subtraction. The purpose of this lesson is for students to use their understanding of the structure of teen numbers to add and subtract from a teen number, without composing or decomposing a ten (MP7). Students solve problems in ways that make sense to them including approaches from a previous section, such as counting on, taking away, or relating addition and subtraction.
- Representation
- MLR8
- Explain (orally and with words or other representations) strategies for finding the number that makes addition and subtraction equations within 20 true.
- Explain (orally) strategies for solving a Take From, Result Unknown problem where a one-digit number is subtracted from a teen number.
- Restemos y sumemos hasta 20.
Required Materials
Activity 3
Required Preparation
- Each group of 2 needs 20 two-color counters and a cup (at least 8 oz).
Suggested Centers
NoneTeacher Reflection Questions
What connections did students make between the different methods shared? What questions did you ask to help make the connections more visible?