Subtracting Two-Digit Numbers (With Regrouping)
Students will subtract two-digit numbers with regrouping, understanding when and why to regroup from the tens place.
Key Questions
- Justify why we 'borrow' from the tens place when we don't have enough ones to subtract.
- Construct a visual model to demonstrate regrouping when solving 42 - 17.
- Analyze the relationship between addition and subtraction when checking a subtraction answer.
Ontario Curriculum Expectations
Suggested Methodologies
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Planning templates for Mathematics
5E Model
The 5E Model structures lessons through five phases (Engage, Explore, Explain, Elaborate, and Evaluate), guiding students from curiosity to deep understanding through inquiry-based learning.
unit plannerMath Unit
Plan a multi-week math unit with conceptual coherence: from building number sense and procedural fluency to applying skills in context and developing mathematical reasoning across a connected sequence of lessons.
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Build a math rubric that assesses problem-solving, mathematical reasoning, and communication alongside procedural accuracy, giving students feedback on how they think, not just whether they got the right answer.
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