Unit 9, Lesson 4
Midamos y ubiquemos
Grado 2
Preparation
Lesson Purpose
The purpose of this lesson is for students to add and subtract within 20. Students measure lengths of objects and represent measurement data in line plots and answer questions about the data.
Lesson Narrative
In this lesson, students continue to practice fluency with addition and subtraction within 20, emphasizing single-digit addition facts they know from memory. Students revisit line plots, which they worked with in a previous unit. They measure the length of objects and use measurement data to create line plots.
- Action and Expression
- MLR2
- Create a line plot to represent measurement data and use line plots to ask and answer questions about measurement data.
- Use a ruler to measure the length of objects in centimeters and explain (orally) how to use mental strategies to solve length problems within 20.
- Hagamos diagramas de puntos, y sumemos y restemos medidas de longitud.
Required Materials
Activity 1
Required Preparation
Activity 1
- Each student needs an unsharpened pencil.
- The activity works best if it is likely that students will have a range of pencil lengths between and among groups. If necessary, sharpen pencils to different lengths and distribute them randomly to students.
Suggested Centers
NoneTeacher Reflection Questions
Reflect on the development of students’ fluency with addition and subtraction within 20. What activities or discussions particularly helped students during the year? What will you do differently next year to foster your students’ fluency with addition and subtraction?
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