# Lesson 7

Meters and Centimeters

### Lesson Purpose

The purpose of this lesson is for students to make sense of the relative size of meters and centimeters and to express meters in terms of centimeters.

### Lesson Narrative

In earlier grades, students measured and estimated lengths in centimeters and meters to develop a sense of each. They learned that there are 100 centimeters in 1 meter. This lesson helps students see the relationship between centimeters and meters in terms of multiplicative comparison (MP7). Building on their work in previous lessons, students recognize 1 meter as being 100 times as long as 1 centimeter. They use this understanding to convert measurements in meters into centimeters.

• Representation
• MLR8

### Learning Goals

Teacher Facing

• Express meters in terms of centimeters.
• Understand the relative size of meters and centimeters.

### Student Facing

• Let’s explore lengths in meters and centimeters.

### Required Materials

Materials to Gather

Materials to Copy

• Centimeter Grid Paper - Standard

Building On

### 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

What evidence do you have that students are thinking conceptually about “100 times as many” and not simply adding zeros to the end of a number without reasoning?

### Suggested Centers

• How Close? (1–5), Stage 6: Multiply to 3,000 (Addressing)
• Compare (1–5), Stage 3: Multiply within 100 (Supporting)