The difficulty of the problem designed by the teacher is within the range of solving problems for the first-grade children. It is not difficult to figure out the problem, but the key is to find the way of thinking. Learn the substitution method, bring the known number into the formula, and you can solve the problem.

The first step is to observe the relationship between various graphs.

The second step is to find the breakthrough point. After the cut-in point is determined, the problem will be solved!

When parents guide their children to do problems, whether they are application problems or graphic problems, please remember to let them "say" the problems themselves. In the process of topic narration, children's understanding of the topic will deepen.