Abstract

We present a descriptive study about the knowledge of eight mathematics teacher educators in the context of a Lesson Study group, in the field of number sense, for primary teacher training. The objective is to identify elements of knowledge through the double perspective of the educators, when their practices consider both their future teachers and primary school students (double-look). Fragments were analyzed in a top-down and bottom-up process. The double-look scenarios appear useful to identify elements of the educator's knowledge, of a different nature from that of a teacher, although associated with it.