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.

When a box containing a penguin arrives anonymously on New Year's Day, a family of four is puzzled, but as they continue to receive one penguin each day their problems--and food budget, and storage issues--are multiplied.

Rhyming text and illustrations demonstrate how many pumpkins it takes to fill a wagon and how quickly they add up each time the number is doubled.