Natural language is known to play a crucial and specific role for children's learning in school mathematics. Not only does it carry special vocabulary, but subtle differences between natural languages may lead to surprising challenges, for instance, for learners who are not taught mathematics in their mother tongue. In this paper, the…

The authors explore how collaborative assessment design is an often overlooked but valid opportunity for professional learning. The article examines how student feedback and a well-designed assessment can reveal potential improvements to the teaching and learning of fractions.