# Lesson 12

Solve Problems Involving Multiplication

### Lesson Purpose

The purpose of this lesson is for students to solve contextual problems that involve multiplication of a single-digit number and a whole number of up to four digits, or multiplication of 2 two-digit numbers.

### Lesson Narrative

This lesson gives students the opportunity to apply the multiplication strategies they have learned to solve various contextual problems involving measurement. The problems vary in format and complexity—some involve a single computation and others require multiple steps to solve. The work here prompts students to make sense of problems and persevere in solving them (MP1) and to reason quantitatively and abstractly (MP2).

• Action and Expression

### Learning Goals

Teacher Facing

• Multiply multi-digit numbers using strategies based on place value and the properties of operations.

### Student Facing

• Let’s solve problems using what we learned about multiplication of whole numbers.

Building Towards

### Lesson Timeline

 Warm-up 10 min Activity 1 25 min Activity 2 10 min Lesson Synthesis 10 min Cool-down 5 min

### Teacher Reflection Questions

As students shared their ideas today, how did you ensure all students’ voices were heard and valued as an important part of the collective learning?

### Suggested Centers

• Five in a Row: Multiplication (3–5), Stage 3: Two-digit Factors (Addressing)
• Compare (1–5), Stage 3: Multiply within 100 (Supporting)

### Print Formatted Materials

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