During this time, I told the first-grade children about decomposition and synthesis. A parent is afraid that his child will not be forced to carry it until midnight the next morning. Parents are still in a hurry. They found me, and I said they didn't need to recite it at all, so that the children could understand the truth. They just need to practice again and again.

The child can accurately calculate the method and tell his parents a long sigh of relief. We should let children learn methods and think, instead of pouring knowledge into their heads, taking out the composition of numbers within 10 and arranging them in a separate unit, and teaching the composition of these numbers based on the idea of division and combination.

There are three reasons for this arrangement. First, division and combination are important ideas, common methods to understand the objective world, and a strategy to learn mathematics. Students should master this way of thinking. The second is to teach the composition of numbers within 10 based on the idea of division and combination.

It is helpful for students to understand the essence of digital composition more deeply. The third is to teach the composition of the number within 10 with the on-off activity as the carrier, so as to provide students with opportunities and conditions for active exploration and memory.