Save your bubble wrap and get hopping! Kids (and adults!) will love popping the bubbles and playing outside. Cut bubble wrap into nine rectangles. Use a permanent marker to give each a number from 1 to 9.
Homemade bubble wand. Make bubble solution by mixing a half cup of water, a half cup of dishwashing liquid, and one tablespoon of vegetable oil. (Multiply these quantities to make the amount of solution you'll need.) Allow the mixture to sit overnight before using. Adding a tablespoon of sugar makes bubbles so durable math teachers us them to teach concepts about spheres.