Truth-tellers and fibbers (logic)
Robots, owls, aliens, parrots, dragons and frogs have seen something hidden: the colour of a kite, where a ball is, which door has the prize, a secret number, the weather. Each says one thing about it. Usually the student is told who tells the truth and who fibs, and works out the answer or says yes or no; in some puzzles they spot the fibber from what is shown.
Everything a fibber says is false, so a fibber saying 'It is not 5' means it is 5. Every puzzle is checked to have exactly one answer, and the working goes through the speakers one at a time.
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What changes each time
- 1 to 3 speakers
- Colours, places, doors, numbers up to 9, weather, pets and flavours
- Find the answer, answer yes or no, or spot the fibber
More patterns, sequences and logic practice
- Skip counting (Grade 1)
- Repeating patterns (Grade 1)
- Hundred chart: 10 more and 10 less (Grade 1)
- Number sequences (Grade 2)
- Number machines (Grade 2)
- Multiples on a hundred chart (Grade 3)
- Ordering from clues (logic) (Grade 3)
- How many to be sure? (logic) (Grade 3)
- Logic grid puzzles (Grade 3)
- Take-away game (logic) (Grade 4)
- Cook it faster (Grade 5)
- Growing patterns (Grade 4)
- Doubling every day (Grade 4)
- Bigger start or bigger raise? (Grade 4)