Kyo had moved onto the multiple-step equations after a while, writing down very simple algebra problems to solve. So far, these were all simple examples that he had pulled from a book in his room, and none of them took very long to solve. He had abandoned all notions of mental calculations at this point, though, writing down each step on paper. He stopped after a while when he started thinking of problems that actually required a calculator to solve properly. Did the housekeeper have one that he could borrow? He would have to wait to see, it seemed.