Converse, inverse and contrapositive
- Exchanging the parts of a true sentence — 3 tasks
- The room inside the outer circle — 3 tasks
- Two moves, four sentences — 4 tasks
- What the contrapositive lets you do — 3 tasks
- Going Deeper — 5 tasks
- Practice — 23 tasks
- Summary — 2 tasks
- Cool-down — 6 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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The Rule Is True: What Follows? — Cut & Glue Sort 25 minutes · 5 sheets
12 pieces, each a true if-then rule and one fact: glue it where the if part must be false, where the then part must be true, or where nothing follows (reasoning by the converse or the inverse).
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Converse, Inverse or Contrapositive — Maze 10–15 minutes · 4 sheets
8 boxes, each an original if-then sentence and a question: which of two sentences is its converse, inverse or contrapositive? The wrong one is always a named error.
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Converse, Inverse or Contrapositive? — Mystery Picture 25–35 minutes · 4 sheets
25 squares, each an if-then sentence made from its row's original and one question: is this the converse, the inverse or the contrapositive? The right answers draw a musical note.