I would make this more challenging for my students by having kids work in pairs. Each child drops in a "secret number" of items into their cup. Then, they count the total number of items in the basket and try to guess how much the other child dropped in.
Here is a fun and interactive way to get your students involved in graphing the results of a taste-test of three different kinds of apples. Introduce children to collecting and organizing data, reading and understanding the results using a graph.