There are three main aspects in mathematical problem solving, especially when the problem includes a real situation: #opa#cp formulating the problem in mathematical terms; #opb#cp operating within the mathematical world; #opc#cp translating the mathematical results into the original situation. In research on problem solving, researchers’ attentions have been mainly paid to the first aspect #opa#cp, and the third aspect #opc#cp has not been deliberated. The purpose of this paper is making this aspect clearer by applying the theory of mathematical modelling to problem solving. Taking problem solving as a kind of mathematical modelling, the mathematical results can be seen as a basis for forecasts, decisions, or actions, and the third aspect of problem solving can be seen as the process in which solvers would make forecasts or decisions and take an action on the problem situation. The example, the case of augmented‐quotient division problems, is presented to illustrate this aspect in detail, and it shows the advantage of the analysis in this paper.