# Lesson 5

Products Beyond 100

### Lesson Purpose

The purpose of this lesson is for students to find the product of a one-digit number and a two-digit number in ways that make sense to them.

### Lesson Narrative

In grade 3, students learned about multiplication and learned to find products within 100. Earlier in this course, students identified factors and multiples, performed multiplicative comparison with whole numbers and fractions, and used the structure of base-ten numbers and properties of operations to find multiples of 10, 100, 1,000, and so on.

This lesson is the first in a series focused on finding whole-number products beyond 100. Here, students reason about equal-group situations involving one-digit and two-digit numbers in any way that makes sense to them. In the first activity, students work with an array of objects to build on a familiar representation. In the second activity, no visual representation is provided. Students may find products by creating arrays or diagrams, decomposing a factor into smaller numbers or place value, and using their understanding of properties of operations.

• Representation
• MLR2

### Learning Goals

Teacher Facing

• Multiply two-digit by one-digit whole numbers in ways that make sense to them.

### Student Facing

• Let’s find products beyond 100.

### Required Preparation

Activity 2:

• Create 4 posters showing the 4 representations shown in the activity narrative.

Building On

Building Towards

### Lesson Timeline

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

### Teacher Reflection Questions

What was the best question you asked students today? Why would you consider it the best one based on what students said or did?

### Suggested Centers

• Can You Draw It? (1–5), Stage 4: Area and Perimeter (Supporting)
• Five in a Row: Multiplication (3–5), Stage 2: Factors 1–9 (Supporting)

### Print Formatted Materials

For access, consult one of our IM Certified Partners.