A cool idea: Throughout the day I drew out a name and that student got to pick a balloon for us to pop. Inside each balloon was a different 100 activity for us to complete. Some examples of things we did are... 100 jumping jacks, draw 100 shapes, count by 2's to 100, do 100 sit-ups, touch our nose 100 times, clap our hands 100 times, blink our eyes 100 times, etc.
Hide 100 kisses in the classroom for the kids to find. On the bottom of each kiss, I write a number from 1 - 100. After the assigned number of kisses have been found by each kid, I'll call them up one at a time and let them add their numbered kisses to the hundred's chart.