# Lesson 13

Decompose Tens or Hundreds

### Lesson Purpose

The purpose of this lesson is for students to subtract from three-digit numbers using place value strategies that include decomposing a ten or hundred.

### Lesson Narrative

In a previous lesson, students subtracted from a three-digit number using place value strategies that included decomposing a ten.

In this lesson, students interpret representations of subtraction that show decomposing a ten and hundred. They use base-ten blocks and their understanding of place value to explain why the method works (MP7). Students may continue to use the base-ten blocks or any representation that makes sense to them to subtract within 1,000.

• Action and Expression
• MLR5

### Learning Goals

Teacher Facing

• Subtract numbers within 1,000 using place value strategies that include decomposing a ten or hundred.

### Student Facing

• Let’s decompose a ten or hundred to subtract.

### Required Materials

Materials to Gather

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

Which students came up with an unexpected strategy in today’s lesson? What are some ways you can be more open to the ideas of each and every student?