Subtraction Strategies: Related Facts
Understanding the relationship between addition and subtraction to solve subtraction problems.
Key Questions
- Explain why we can solve a subtraction problem by thinking about addition.
- Construct a fact family for the numbers 4, 6, and 10.
- Analyze how knowing 8 + 2 = 10 helps you solve 10 - 2.
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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Moving from counting all to using the 'counting on' strategy for addition within 20.
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Using the 'making ten' strategy to add numbers within 20, understanding number bonds to ten.
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Subtraction Strategies: Counting Back
Developing subtraction strategies by counting back from a given number within 20.
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Understanding the Equal Sign
Reframing the equal sign as a symbol of balance, representing that both sides of an equation have the same value.
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Finding the Unknown in Equations
Solving for the unknown whole number in addition and subtraction equations within 20.
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