This is an in-class project designed to teach students about scale factor. Students will need one Starburst candy, a ruler, tape, colored pencils, and two pieces of graph paper taped together.
First, tape the Starburst wrapper down on the graph paper, trying to align it as closely to the grid as possible. I recommend using a side corner of the graph paper. As a class, decide on the measurements of the Starburst wrapper--you will probably have to round to the closest centimeter.
Then, students will work independently to multiply the measurements of the Starburst wrapper by the given scale factors. They will draw the new measurements on the graph paper and shade them in with colored pencil. Some scale factors are whole numbers and some are fractions.
This activity takes about an hour. Students enjoy it, due to the opportunity to eat candy, but also for its hands-on nature. I find this activity very instructive for students who are having a hard time conceptualizing what scale factor actually is.