Lesson 21

Día 3 de centros

Lesson Purpose

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

Lesson Narrative

In Activity 1, students learn stage 1 of the center, How Close? In Activity 2, students learn stage stage 3 of the center, Five in a Row. In both activities, students have opportunities to apply methods and concepts from the section such as counting on, making a ten, adjusting addends (using known facts), and using the commutative and associative properties.

  • Action and Expression
  • MLR8

Learning Goals

Teacher Facing

  • Students add two and three numbers within 20.
  • Students write equations with three addends.

Student Facing

  • Juguemos juegos en los que sumamos y restamos.

Required Materials

Materials to Gather

Materials to Copy

  • How Close? Stage 1 Recording Sheet, Spanish
  • Five in a Row Addition and Subtraction Stage 3 Gameboard, Spanish

Required Preparation

CCSS Standards


Lesson Timeline

Warm-up 10 min
Activity 1 20 min
Activity 2 20 min
Lesson Synthesis 10 min

Teacher Reflection Questions

What methods are students using to add three numbers? What questions have you asked to encourage them to make a ten?

Print Formatted Materials

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Student Task Statements pdf docx
Lesson Cover Page pdf docx
Teacher Guide Log In
Teacher Presentation Materials pdf docx
Blackline Masters zip