Peter is unwilling to learn the multiplication tables at school. He would rather work as an acrobat at the circus, just like his friend Susanne. When the class plans a trip to the circus, Peter is supposed to buy the tickets. Since he miscounts and buys one ticket less than needed, he cannot join his schoolmates. Susanne, however, comes up with an idea and lets him work in the circus arena where he is supposed to check on the arithmetic problems of a numerate donkey. When Peter fails to control the donkey, he feels deeply ashamed and has to assess that math is needed in all parts of life.