The number of four to eight is 12, and the analysis process is four to eight. Addition is needed here, that is, 8+4= 12. Whether the proportion of the second volume of senior one mathematics is more or less, or how much is a * * *, the remainder is a basic mathematical concept. It has a relatively fixed quantitative relationship, but compared with a * * * and how much is left, children have more contrast and less firm understanding. Children in Grade One must first understand the meaning of the problem before they can solve it well.

In the first grade of mathematics, children have realized that reducing this number with a big number can solve the problem that one number is more or less than the other. In the next book, there are special math problems. For example, Kobayashi's family has 20 rabbits and 1 1 sheep, and rabbits only have 20- 1 1=9. After teaching students to analyze problems, most teachers will sum up, using less subtraction and less multiplication ratio, that is, the reduction of large numbers. However, when using the ratio of changing format again, you will encounter problems. One reason why we can't solve problems flexibly is that we can't understand the meaning of the questions, which leads to the inability to think backwards.