In this study, we analyzed the practice of 7-grade mathematics lessons and its Kyozaikenkyuu (studies of subject matter) from the perspective of children’s Cognitions. In those practice, we focused on individual support for a student. For the student, we planned a course of the support, and we choose the “Planning” and “Simultaneous” processes from 4 kinds of process to regard. In the lesson plan, the teacher describes concrete support plan for the student. “Simultaneous” process has strong connection between the “Successive” process and those processes complement each other. So we regard these two point evenly when we plan the supports. On the other hand, we realized that making “Simultaneous” process importance let the Kyozaikenkyuu deeply, and we could set clear goal in the lesson through those view. And we planed the supports of “Planning” process, those demand students the conscious choice of own strategy and the explanation of strategy each other. The supports presented in this practice is taken in the other grade’s or other subject’s lessons. We have to improve the supports about “Simultaneous” and “Planning” processes continually.