This activity is designed to introduce the formula for volume of spheres in a way that is engaging, memorable, hands-on, and very tasty.
Students will measure the circumference of a spherical piece of candy and use the formula to approximate the radius. Then, after considering more familiar formulas for circumference and area of a circle, students will predict that the formula for volume will require the radius to be cubed. Finally, students will use the formula for volume of a circle to approximate the volume of their candy.
I have found Cry Babies (sour gumballs) to be the most popular with my 8th graders, but any spherical candy will do. The student handout guides kids through the activity step-by-step, and lesson instructions (along with a key) are provided for easy implementation. An optional cover page is also included so teachers who use interactive notebooks can turn the activity into a convenient foldable by running double-sided copies.
As with all my products, this resource carries a multiple license so you can share it on a limited, non-commercial basis with other teachers in your school system. Please see my copyright page for more details on that.
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Thanks so much for visiting my store, and I hope you and your students benefit from this resource!
For more resources related to volume, check out my:
Volume and Surface Area Koosh Ball Game for Interactive Whiteboards
For more food-based geometry activities, check out my:
Pythagorean Theorem Modeling Activity with Cheez-its
8(7)(A) The student is expected to solve problems involving the volume of cylinders, cones, and spheres.
8.8B – Connect models of prisms, cylinders, pyramids, spheres, and cones to formulas for volume of these objects.
8.8C – Estimate measures and use formulas to solve application problems involving lateral and total surface area and volume.