Play to Learn: Silent Division Practice

I invented this game on the spot one day when we were waiting in the hallway for a specialist.  I needed to keep my students quiet and engaged.  I called out division problems and students needed to respond with the corresponding number of fingers.  This could easily be adapted for addition or subtraction if that's the age group you have.

What tips do you have to keep students quiet in the hall?  To comment and read more about this game, please visit this post at Artistry of Education.