# Lesson 16

Multiply Numbers Larger than 20

### Lesson Purpose

The purpose of this lesson is for students to multiply within 100, where one factor is greater than 20.

### Lesson Narrative

Previously, students have used strategies based on place value and properties of operations to find products of a whole-number and a teen number. Here, students extend this work to larger two-digit numbers. Students first analyze different strategies and then apply one or more of them to find the value of other products. The lesson also includes an optional game students can play to apply what they’ve learned to multiply larger numbers.

• Engagement
• MLR8

### Learning Goals

Teacher Facing

• Multiply within 100, where one factor is greater than 20.
• Use properties based on place value and properties of operations to multiply.

### Student Facing

• Let’s multiply numbers that are larger than 20.

### Required Materials

Materials to Gather

Materials to Copy

• Centimeter Grid Paper - Standard
• Number Cards (0-10)

### Required Preparation

Activity 3:

• Create a set of cards from the blackline master for each group of 2.

Building On

Building Towards

### Lesson Timeline

 Warm-up 10 min Activity 1 15 min Activity 2 15 min Activity 3 10 min Lesson Synthesis 5 min Cool-down 5 min

### Teacher Reflection Questions

When do your students feel successful in math? How do you know?

### Suggested Centers

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