Teachers are you tired of looking for dice to use in your math class? Or are the dice you do use to loud and noisy when used?
Here is a simple solution, a regular pencil can double nicely as a 6-sided die.
Since a normal wooden pencil has 6 sides, all it takes is a pen to turn it into a die of sorts. Just pen in the numbers 1-6 on each side, and roll it along the table to pick a number at random.