I used to ask kids a lot of Fermi-type questions — for fun and for them to think about estimation and exponents and problem solving and finding answers to some key questions.
Today’s question is on a much smaller scale than that which is typical of Fermi questions: How many water balloons would it take to fill up this classroom?
Now I get to judge which of the six groups’ answers is the “best” one. Their answers were:
[According to my calculations, it would take 643,000 water balloons to fill up this classroom. I think we have a winner.]