In this paper we describe how a teacher makes decisions during interaction with students in order to guide their focus towards the lesson's objectives that the teacher has in mind. In particular, in the paper we examine how a mathematics teacher's knowledge connects with the teacher's noticing skill and interactive action. We present the case of a…

As part of Japanese Lesson study research focusing on "comparing and describing likelihoods", fifth grade elementary students used real-world data in decision-making. Sporting statistics facilitated opportunities for informal inference, where data were used to make and justify predictions.