What number makes sense? Standard word problems with nonstandard wording

International audienceIn the reported experiment, we focus on word problems of the type What number makes sense, which comes from Singapore textbooks. This problem was set to primary school 5 th graders. In the analysis of the experiment, we focus on mathematical reasoning involving argumentation and on communication observed in pupils' discussions while solving the problem. We comment on pupils' reactions in terms of three approaches (mathematical, linguistic, real contextual) of which we have kept record also in our previous experiments