Turn lemons into learning fun on a math-filled adventure. Tad, Lily, Leap and friends stir up lots of learning fun when they decide to sell lemonade and use their earnings to buy new books for the library. With the help of Cousin Toad, Matilda, Quigley, and Burfder, the twins apply their new skills in counting, addition, and subtraction to their new venture of making the most delicious lemonade ever.