Lesson 27

Center Day 4

Lesson Purpose

The purpose of this lesson is for students to practice adding and subtracting within 20.

Lesson Narrative

Students learn new stages in two centers that focus on adding and subtracting within 20. Students have opportunities to practice methods such as finding the difference by counting on, taking away, making 10, and using addition facts.

  • Action and Expression

Learning Goals

Teacher Facing

  • Add and subtract within 20.

Student Facing

  • Let’s play games to practice addition and subtraction.

Required Materials

Materials to Gather

Materials to Copy

  • How Close? Stage 2 Recording Sheet
  • Compare Stage 2 Subtraction Cards to 20

Required Preparation

Activity 2:

  • Create a set of Compare Stage 2 Subtraction Cards for each group of 2.
  • Each group of 2 needs a set of Compare Stage 2 Addition Cards from a previous lesson.
  • Gather materials from previous centers:
    • Compare, Stage 1
    • How Close? Stages 1 and 2
    • Five in a Row, Stages 1-3

CCSS Standards


Lesson Timeline

Warm-up 10 min
Activity 1 15 min
Activity 2 25 min
Lesson Synthesis 10 min

Teacher Reflection Questions

Reflect on who got to do math today in class. What norms or routines allowed those students to engage in the mathematics? How can you adjust these norms and routines so all students do math tomorrow?

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Lesson Cover Page pdf docx
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Teacher Presentation Materials pdf docx
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