Present this problem to your kids. It is taken from the Connected Mathematics Project, developed by Michigan State University.

Melting Ice Cream Olga gets a scoop of ice cream in a cone, and Serge gets a scoop in a cylindrical cup. Each container has a height of 8 cm and a radius of 4 cm, and each scoop of ice cream is a sphere with a radius of 4 cm.

1. If Serge allows his ice cream to melt, will it fill his cup exactly? Explain.
2. If Olga allows her ice cream to melt, will it fill her cone exactly? Explain.

Follow-up: How many scoops of ice cream of the above size can be packed into each container?