Lesson 21

Rompecabezas de fichas geométricas (optional)

Lesson Purpose

The purpose of this lesson is for students to apply their understanding of composing shapes and addition in the context of money.

Lesson Narrative

This lesson is optional because it does not address any new mathematical content standards. This lesson does provide students with an opportunity to apply precursor skills of mathematical modeling.

In previous lessons, students found different ways to use pattern blocks to compose the same shape. They also used their understanding of coins and their values to solve addition problems.

In the warm-up, students are introduced to the context of a pattern block puzzle and use mathematical language to compare how the shapes are composed. In Activity 1, they create and solve pattern block puzzles. In Activity 2, they solve addition problems involving money within the pattern block puzzles context.

• Action and Expression
• MLR7

Learning Goals

Teacher Facing

• Identify and compose new shapes from smaller shapes.
• Solve addition problems in the context of money.

Student Facing

• Hagamos rompecabezas de fichas geométricas.

Required Materials

Materials to Gather

Lesson Timeline

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

Teacher Reflection Questions

As you finish up this unit, reflect on the norms and activities that have supported each student in learning math. List ways you have seen each student grow as a young mathematician throughout this work. List ways you have seen yourself grow as a teacher. What will you continue to do and what will you improve upon in Unit 7?

Suggested Centers

• Would You Rather? (2–5), Stage 1: Money (Addressing)
• Picture Books (K–5), Stage 3: Find Shapes (Addressing)
• How Are They the Same? (1–5), Stage 2: Grade 2 Shapes (Addressing)