We celebrated 100th Day in our classroom in February.  We did a variety of activities to celebrate the number 100.  We counted to 100 many different ways (1's, 5's, 10's), measured with various objects (paper feet, paper clips, linking cubes), did some 100 piece puzzles, tried to stack 100 cups, and sang some great songs about 100.  During our gym time we did many activites that related to 100, also.  Our favorite was running around the gym for 100 seconds!  It was a busy day.