Lesson 13
Descompongamos decenas o centenas
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
- Descompongamos una decena o una centena para restar.
Required Materials
Materials to Gather
Required Preparation
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?
Suggested Centers
- How Close? (1–5), Stage 4: Add to 1,000 (Addressing)
- Five in a Row: Addition and Subtraction (1–2), Stage 8: Add within 1,000 with Composing (Addressing)