I recently discovered Tarsia Puzzles and they are my new favorite
go-to activity for practicing math problems. In this lesson, I used them
to practice Scientific Notation. This puzzle has problems with negative and positive exponents - several have the same coefficient so students really have to think about the function of the exponent. The students had to correctly work out 30 problems to piece
the puzzle together and they had way more fun practicing this way than a
worksheet. I overheard some great discussions about the rules and
misconceptions (which they can self-identify when they don't find the
answer they are looking for).