It is not complex to teach the algorithm for multiplying fractions so that children can multiply numerators and denominators to arrive at correct answers. However, it is a challenge to teach so that students build understanding of multiplication of fractions, extending what they have already learned about fractions and about multiplication of whole numbers. This paper describes three days of instruction with fifth grade students in March during the school year. Rather than offer polished lessons, this paper offers a glimpse into actual classroom instruction to provide a platform for discussing mathematical instruction of a traditional skill in a way that focuses on children's thinking and reasoning. (Author)