Young Charlie is having trouble with his first grade addition homework, so his father decides to help. He teaches the Charlie how to add small numbers by counting on his fingers. Eventually, the little boy becomes quite good. “But remember,” the father says, “you can’t use your fingers in school — you’ll have to do it in your head.” The next day at school, the teacher calls on Charlie and asks him “what is five plus five?” Charlie starts to raise his hands, but remembering what his father said, hides them in his pockets. After a few seconds of counting, Charlie announces “Eleven!”