Lesson 7
Subtract Your Way
Lesson Purpose
The purpose of this lesson is to activate the strategies students have for subtracting numbers within 1,000.
Lesson Narrative
In grade 2, students subtracted numbers within 1,000 using various strategies based on place value and the associative and commutative properties of addition. They used base-ten blocks, base-ten diagrams, equations, and number lines to represent their reasoning.
In this lesson, they review a variety of strategies with an emphasis on subtracting hundreds and hundreds, tens and tens, and ones and ones. Students should have access to base-ten blocks.
- Representation
- MLR8
Learning Goals
Teacher Facing
- Subtract within 1,000 in a way that makes sense to them.
Student Facing
- Let’s subtract numbers within 1,000.
Required Materials
Materials to Gather
Required Preparation
CCSS Standards
Addressing
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 strategies are students most comfortable using to subtract within 1,000? How will you leverage that student understanding in upcoming lessons on subtraction algorithms?
Suggested Centers
- How Close? (1–5), Stage 4: Add to 1,000 (Addressing)
- Number Puzzles: Addition and Subtraction (1–4), Stage 5: Within 1,000 (Addressing)