Preheat oven to 350°F. Spray a 13"x9" baking pan with non-stick cooking spray. Set aside.
Prepare brownie mix according to package instructions. Pour into prepared pan. Bake for 28-31 minutes. Let cool. Cut into 12 rectangles.
Pipe math problems with white icing. Then pipe a border with the Pillsbury Pastry Bag Chocolate Fudge Frosting. Top with school-themed sugar toppers or sprinkles. Serve immediately or store covered for up to 3 days.