Evan and his younger sister, Jesse, react very differently to the news that they will be in the same class for fourth grade and as the end of summer approaches, they battle it out through lemonade stands, each trying to be the first to earn 100 dollars. Includes mathematical calculations and tips for running a successful lemonade stand.

Although many things go wrong when Froggy decides to make money by setting up a lemonade stand, he still has fun with his friends.

After enjoying their mother's lemonade, Brother, Sister and Honey Bear decide to start up a lemonade stand to sell it to the neighborhood.