Deductive reasoning: detachment and syllogism
- What a rule forces and what it does not — 3 tasks
- The picture that decides what is forced — 3 tasks
- The arrow runs one way — 3 tasks
- Joining two rules into one — 3 tasks
- Going Deeper — 4 tasks
- Practice — 26 tasks
- Summary — 2 tasks
- Cool-down — 3 tasks
Classroom activities
Things a class does rather than writes on. Each one is a finished PDF: print it, cut it up if it says so, and hand it round.
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Detachment, Syllogism, or Nothing Follows? — Cut & Glue Sort 25 minutes · 5 sheets
12 pieces, each two given sentences. Students sort them into three rows: the Law of Detachment gives a conclusion, the Law of Syllogism gives a conclusion, or nothing follows.
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What Follows? Detachment and Syllogism — Maze 10–15 minutes · 4 sheets
8 boxes, each with two given sentences and two answers to "What follows?". A wrong answer sends the student to a box that shows the mistake.
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Does It Follow? Detachment and Syllogism — Mystery Picture 25–35 minutes · 4 sheets
25 squares in five rows. Each row has its own given sentences, and each square asks one thing: does this sentence follow from them? The right answers draw an arrow.