Unit 3, Lesson 7
Subtract Your Way
Grade 3
Preparation
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, students 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
- Explain (using words and other representations) strategies for subtracting within 1,000.
- Interpret (orally) base-ten diagrams that represent decomposing units and subtracting by place.
- Let’s subtract numbers within 1,000.
Required Materials
Required Preparation
None
Teacher Reflection Questions
What strategies are students most comfortable using to subtract within 1,000? How will you leverage that understanding in upcoming lessons on subtraction algorithms?