This delicious activity will allow students to practice using fractions with a realistic everyday example: baking! They need to take a recipe that has several fractions in it and double it. After that, they need to figure out how much of each ingredient would be needed if the recipe was made five times bigger. I encourage my students to use different strategies: drawing pictures, repeated addition, or multiplication.
As an extension, students can bring in their own recipes from home in the next class and double them as well. You might even want to actually make something tasty to eat too!