Formal logic and fallacy
KS5 · 40 minutes · Test arguments for validity and soundness.
Answer by: Type. You can change method or take a break at any time.
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Our learning goal
Test arguments for validity and soundness.
Your turn: Choose one thing you would like to understand by the end.
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My lesson notes & project
Full teaching script
- Today: Formal logic and fallacy. Our goal: Test arguments for validity and soundness.
- Take one idea at a time. Pause after each sentence; ask for repetition whenever you need it.
- An argument is valid when the conclusion must follow from the premises; sound when it is valid AND the premises are true. Watch for affirming the consequent, straw man, appeal to authority and false dilemma.
- Together: choose one example from the explanation and show how it works. What do you notice?
- Your turn: Write one valid-but-unsound argument and one invalid-but-persuasive one.
- Reflect: what made sense, and what would you like explained differently?
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