體積立體

My students loved filling these with water to see which shapes held more—the removable base made cleanup so easy. We compared the cone to the cylinder and it finally clicked why the volume is one-third.

My third graders were able to directly verify that two different-looking shapes can hold the same amount of water, which made the volume concept click instantly. The stopper seals tightly enough for sand as well as liquid.

The removable base makes filling these with water or sand so simple, no more messy spills during our homeschool math lessons. My kids can finally see how volume compares between different shapes, and the stopper seals tight enough for quick experiments. Definitely worth it for hands-on learners.