Scholastic
Scholastic Teachers: Celebrate the 100th Day of School!
Scholastic has put together 100th day math ideas from several different teachers. Includes "zero, my hero", probability, sorting, measuring, estimating, counting, weighing, money, and other ideas for celebrating the 100th day.
PBS
Pbs Learning Media: Measuring With Mixie Bot
Children can measure with a favorite character to understand the value of standardized units of measure, such as inches and feet. This activity will help them practice measuring and understand comparing the measurements of one item to...
Other
Teachers first.com: 50 Ideas for the 100th Day of School
Great ideas for "100th Day" activities. Most of these would be a good challenge for upper elementary school students if you want to include them in your 100th Day celebration. Activities include counting, measuring, weighing, sorting,...
University of Missouri
Famous Trials: The Osage "Reign of Terror" Murder Trials
The "Reign of Terror" that overtook the Osage Reservation in 1921 is just one chapter in the long story of mistreatment of Native Americans by whites, but is one of the most horrifying. Before the chapter ends, untold dozens of Osage...