In physical education, students can count how many times they can perform a repetitive activity in 100 seconds. For example, how many jumping jacks they complete in that time. For a varied routine, students can perform 10 counts of 10 exercises, such as 10 sit-ups and 10 leg raises.
Students can fasten 100 of the same item on a paper with a grid of 100 squares. For example, one student can collect 100 grains of rice while a classmate collects 100 paper clips. For a counting exercise, the whole class can count by hundreds and see how far they can go.
For a large-scale art project, students can cut 100 squares from colored paper or magazine pages. The students can arrange a scene or a collage using these 100 picture elements. Their artwork can reach out into the community when they create 100 cards to give to a local seniors' residence or to mail to people in the military.
Students can list 100 adjectives and write each word on a square of colored paper. Form a word quilt for the wall out of the word squares.
Students can compile a list of 100 favorite book titles from the school library. A banner listing these titles can hang in the classroom or perhaps in the hallway to let other students view this favorite reading list.
Students can make a book or album of 100 symbols or warning signs, including symbols they should identify in their community. For example, students should know the symbol for a train crossing. Students can indicate locations of actual signs or symbols on a street map included in this book.
Accomplished people and important inventions can also serves as themes for 100th-Day activities. Students can list 100 influential people in today's world or 100 historic figures. Students can also compile a list of 100 inventions from the last 100 years.
Students can brainstorm 100 ways or services to help the less fortunate. For example, the list can start with socks and vaccinations. If the class donated a hypothetical or real $100 to a charity that purchases goods or animals for distribution, they can discuss what items they would like to see donated. For example, a farming community in a developing country may need a micro-loan to purchase seeds to grow cash crops. A family recovering from a flood may need a goat to provide milk and cheese.