Lesson 15

Grupos iguales, números más grandes

Lesson Purpose

The purpose of this lesson is for students to multiply within 100, where one factor is a teen number.   

Lesson Narrative

The work of this lesson connects to previous work because students have seen a variety of ways to represent and solve problems in which one of the factors is a teen number. In this lesson students use their choice of strategy and representation to solve these types of problems. Students participate in a gallery walk to highlight different ways that they solved problems with a synthesis that highlights the area diagram to represent one of the problems. Students’ attention is drawn to scaling of area diagrams during the warm-up. While it’s not important that student representations are exact, it is important that any area diagrams presented to students are to scale.

  • Engagement
  • MLR8

Learning Goals

Teacher Facing

  • Multiply within 100, where one factor is a teen number.

Student Facing

  • Resolvamos algunos problemas de grupos iguales que tienen números más grandes.

Required Materials

Materials to Gather

Materials to Copy

  • Centimeter Grid Paper - Standard

Required Preparation

CCSS Standards


Building Towards

Lesson Timeline

Warm-up 10 min
Activity 1 20 min
Activity 2 15 min
Lesson Synthesis 10 min
Cool-down 5 min

Teacher Reflection Questions

What question do you wish you had asked today? When and why should you have asked it?

Suggested Centers

  • Compare (1–5), Stage 3: Multiply within 100 (Addressing)
  • How Close? (1–5), Stage 5: Multiply to 100 (Addressing)

Print Formatted Materials

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