I love math projects that involve baking. This lesson was on fractions. My son had to figure out how his brownie recipe would change if the quantity changed. For example if you made brownies for only the people in your family (6) versus the number of kids in your class (32). I loved that this project gave him a real life application on why learning how to add and subtract fractions is important (and tasty).
Yes, baking + math = a whole lot of fun!