this game works well outside, but you can do it inside as long as you have an uncluttered area.
Students form a circle and start walking around clockwise while you call out numbers, mostly multiples of 10, 100, or 1000. When they hear a number that is not a multiple of 10, 100, or 1000, they sit down. Anyone who didnot is out. Keep giong until there's only one person left.