Maja's business takes place in a small general store in a small town somewhere in Sweden. Every day, Dag-Otto comes there to leave mail, but because he is very fond of Maja, he is happy to stay and help her with all sorts of chores. In each episode, something happens that requires an urgent mathematical solution. To solve the problem, an understanding of some basic arithmetic skills is required. Unfortunately, Maja and Dag-Otto are not big fans of math, and a lot of funny complications and situations arise when they try to fix that dilemma.