We invented a great game in
Physics class the other day. Well, not great. But it passes a few minutes while
kinetic theory is going on around you.
First things first. You need a calculator that does not keep a running tally of the calculation thus far. Then start hammering. 1+1+1+1+1+1+1+1+1+1+1...... The other player has to guess the eventual result. The difference between this and the actual amount is added to the score of the person who was using the calculator. Then you switch over. Rinse and repeat.
Sad, I know.