Stimulating creative problem solving in mathematics

• The slides: As used during the workshop (with all pauses) and One page per slide (no pauses); also, a PDF with just the questions
• The lecture notes of the course Kaleidoscope
• A blog post on the `mathematical' problem of the strange addition (in English)
• A blog post on the problem of comparing 1000<sup>1001</sup> and 1001<sup>1000</sup> (in Dutch)
• An article in the math journal Pythagoras about the `blind date' problem (in Dutch);
  Here is the actual question on the wisfaq website