This project spawns a lot of related ideas. You could build on the existing project by creating an interactive math lesson that asks a user to choose a starting number. Then, calculate the results and explain the math behind the results. After that, prompt for user-selected values.

You could use the stamp block to fill up the stage with grains of rice to show the power of doubling.

Our formula used a simple interest calculation, but you could apply the same principles we learned in this chapter to build a project to calculate and graph compound interest.

Of course, you could also create a project that illustrates mathematical folktales.

Using the pen tool in conjunction with the mathematical functions, you can create elaborate interactive art projects. Our project created a simple graph, but stop by the Pen Gallery on the Scratch web site for some inspiration: http://scratch.mit.edu/galleries/view/24716.