Lesson 15
Equal Groups, Larger Numbers
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
- Let’s solve some problems with equal groups that have larger numbers.
Required Materials
Materials to Gather
Materials to Copy
- Centimeter Grid Paper - Standard
Required Preparation
CCSS Standards
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
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 | docx | |
| Lesson Cover Page | docx | |
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| Teacher Guide | Log In | |
| Teacher Presentation Materials | docx | |
| Blackline Masters | zip |