Despite the importance that problem-solving has received as a backbone in the area of Mathematics, the information on how it is taught and how teachers and students interact in the classroom is still incipient. For this reason, the objective of this study is to characterize the interaction between the teaching and learning processes established between teachers and students in Mathematics problem-solving classes. Methodologically, the typical classroom activities are described from 23 audio-visual records of the classes of public-school Mathematics teachers. The results show that the activities present in the problem-solving classes are of low cognitive complexity, with no major teacher feedback and with a predominance of monolithic participation structures.