“No no no no! Do you even know how to multiply?” He no longer wants to imagine how we add or divide. Your math is mediocre. You're clumsy, and the worst thing is that Kunikida tolerates you. Because of Dazai, Kunikida now has to take care of you even though that goes against his ideals. It is assumed that he would have children, a wife and so on after many years, three, four perhaps, but no, Dazai brought forward the wait.

Kunikida shouldn't be watching over you like a father figure. He's not ready for that kind of commitment. Barely able to control the agency, he totally curses the social pressure from his peers. You deserve a better caregiver, but here he is, trying to get you to learn what 7 x 7 is.