Measuring Millimeters

Cut a rope into 100 millimeter pieces. Give each student a piece. Ask them to find things in the classroom that are shorter, about the same length, and longer than the rope. Then repeat the activity outside if the weather allows. If you can’t go outdoors, move the activity to the library. Commemorate the day with “I’m 100 Days Stronger, Smarter, Sharper” 2-Sided Paper Bracelets or “100th Day Of School Is Cool” Laminated Backpack Tags With Chains.