1. Look for different ways for each number.
  2. What extra key would you need to make 11 with four fours?
  3. I made 11 numbers between 10 and 50 - can you find them? Maybe there are more.
  4. When don't you need to use the "=" along the way?
  5. Try the puzzle on a basic calculator - does it work the same as the game?
  6. Why did I insist on getting the numbers in order?
  7. What is the biggest number you can make?
  8. How about the smallest?
  9. Make up your own puzzle.