Using Cheerios, Fruit Loops or other doughnut-shaped cereal, count out 100 rounds for each student or have the students assist with the counting. Counting by tens is helpful with young children. Prepare lengths of string or curling ribbon long enough to hold 100 rounds of cereal. If using string, wrap tape around one end to make the string stiff enough that a preschool student can easily push it through the hole in the cereal. Tape the other end of the string or curling ribbon to the child's desk or table. This will stop the cereal from sliding off while the children are working and will hold the necklace in place while they work. Children thread the string through each round of cereal and, when finished, the teacher ties the ends of the string together, making an edible necklace that each child can take home.
Have the students draw or paint a picture. Let children come up with their own topics or have them relate the drawings to a book you have read together in class. When the drawing is complete, have the students decorate it with 100 objects, such as beans, cereal, dog food, buttons or noodles. The children can use a small plate with non-toxic glue and dip each object into the glue before pressing it onto place on the picture. The artwork also makes colorful decorations for the classroom or hallway during your school's 100 days celebration.
Have each student draw or paint a picture of a pond. Provide each child with 100 gold fish crackers and plates or dishes of non-toxic glue. Each student should dip the gold fish in the glue and then press the fish onto the middle of the pond. If the children are unable to paint a pond, have them paint or color their papers using different shades of blue.
Read books together such as "Biscuit's 100th Day of School" by Alyssa Satin Capucilli, "The Night Before the 100th Day of School" by Natasha Wing and Mindy Pierce or "Fancy Nancy: The 100th Day of School" by Jane O'Connor. Use the characters or story line to create pictures, such as drawing dogs like Biscuit and gluing 100 pieces of dog food or dog biscuits to the picture. Recite poems or cheers, or sing a song about the 100th day of school. Come up with your own song ideas by changing the words of familiar children's songs.
Ask the children to bring in non-perishable food items, such as canned goods or macaroni and cheese. Collect 100 items and donate them to a local charity or soup kitchen. Have the students help you count the items as you box them up to donate them. Take pictures of your collection of items and celebrate with the children to get them excited about helping others. Alternately, have children each bring in 100 pennies and donate the money to a charity.
Cut 100 strips of paper approximately 1 inch wide and 6 inches long. Use paper in different colors, such as construction paper or used wrapping paper. Have the students help you form one paper into a circle and tape or staple the ends together to make a shape like a bracelet. Stick another piece of paper through the first round and close it over to make the second link in your paper chain. Continue this process until you have attached all 100 links. Make one chain or several and use them to decorate your classroom for the 100th day celebration.