From 1754-1769, a monthly mathematics journal for teachers was published in the Netherlands. The journal was a combination of mathematics and news; the news sheet contained items on vacancies, comparative exams for new posts and other items which were of relevance to teachers in Dutch schools. The mathematics section contained some theory, many mathematical problems and their solutions, sent by readers and published a few months after the problems and discussions on some of the solutions. The readers were encouraged to send mathematical problems, in the form of questions. The content provides insight in the mathematical knowledge of teachers in the 18th century. Most of the questions were on arithmetic, algebra and geometry combined with algebra, however, there was also a small number of problems solved with fluxions, differential calculus, using Newton’s dot notation. In this paper the use of differential calculus by the teachers in the 18th century is analysed and discussed.