This is the first episode of Spøkelser etter avdøde størrelser that will be completely in English. Or almost completely. The episode begins with a few sentences in Norwegian, but then it switches to English. Niclas Larson has met Zelha Tunç Pekkan, a colleague from the Department of Mathematical Sciences. They discuss Zelha’s experiences of and research about the teaching and learning of fractions. The topic of fractions is challenging for many students. What is so difficult with fractions and are there any suggestions of how to deal with them?