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

Addressing

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

Teachers with a valid work email address can click here to register or sign in for free access to Cool Down, Teacher Guide, and PowerPoint materials.

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