I am concluding my second year in mathematics at the university of Milan. I also happen to be an educator for 8 - 12 year old children (as a Scout).
Recently I have tried to fill some dead time by asking my kids some soft math/logic questions and having them argue about them among themselves.
Little did I know that my tiny project would have so much success that they now demand more questions, especially at lunch, and I have exhausted my store of puzzles.
I also found that while I sometimes manage to come up with a new one, it is often too easy or too hard for their age.
Does anybody know of some resource covering this kind of... thing?
Straight-up question suggestions are also welcome.
Here is a sample of the questions I gave them (brutally stripped of the playful, narrative parts):
A certain frog doubles in size every day. When thrown into a well, it fills the well in 10 days. How many days does it take to fill a well, if I throw two frogs in it?
How high up can you count using only the 10 fingers of your hands? (Really "how many numbers can you represent", made them discover the binary counting).
How many fingers are there in one hand? And in two? And in ten? (evil trick question: almost everybody answers "a hundred" to the last question).