Celebrations and project ideas for the 100th day of the school year typically center on amassing collections of 100 items, according to About.com. Students can also hunt for numbers from 1 to 100 in the classroom and create art projects using 100 items.
Students can celebrate the 100th day of class by building a structure out of 100 LEGO pieces, counting to 100, separating 100 jellybeans by color, jumproping 100 times, listing 100 types of food, or stacking 100 pennies. Another great project is to have students create a display at home using 100 items then bring it to school and present it to the class. These projects might display 100 pretzels, hair clips, collectible buttons, action figures, state quarters or pieces of cereal.
Milestone celebrations are popular with schools and kid-centered organizations around the country. A Girl Scout troop in Maryland celebrated the 100th year of the Girl Scouts organization by creating a formation of the number 100 using girls from the troop.
Kids Play and Create has several simple project ideas for the 100th day of school. Kids can draw a large apple on a piece of cardboard and fill in the apple with red M&M's or other types of candy. The M&M's can be adhered with glue or an edible item like frosting. Alternatively, kids can draw a large bear on the cardboard and then fill the bear in with 100 gummy bears.
Scholastic has a list of 55 ideas that can be used to celebrate 100 days of school. The age range of the activities is from pre-K to grade 5. Some ideas for smaller children are to create something using 100 Q-Tips or Lego blocks, hopping across the playground 100 times or writing about what things could be bought with $100.