In previous lessons, students revisited subtraction within 1,000 using strategies based on place value, properties of operations, and the relationship between addition and subtraction. In this lesson, students are introduced to a subtraction algorithm that clearly shows the subtraction of ones from ones, tens from tens, and hundreds from hundreds, and is similar to one of the initial addition algorithms in a prior lesson. Students should have access to base-ten blocks as needed.
- Relate base-ten diagrams to written algorithms for subtraction.
- Let’s learn a new way to subtract.
Materials to Copy
- Diagrams and Algorithms
- Create a set of cards from the blackline master for each group of 2.
|Activity 1||15 min|
|Activity 2||20 min|
|Lesson Synthesis||10 min|
Teacher Reflection Questions
Reflect on how comfortable your students are asking questions of you and of each other. What can you do to encourage students to ask questions?
- How Close? (1–5), Stage 4: Add to 1,000 (Addressing)
- Number Puzzles: Addition and Subtraction (1–4), Stage 5: Within 1,000 (Addressing)
- Five in a Row: Multiplication (3–5), Stage 2: Factors 1–9 (Supporting)
Print Formatted Materials
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