Let the children observe and discuss the arrangement of fish in the picture, analyze the meaning expressed in the picture, and inspire the children to think about writing application questions. Let individual children say their own application questions, and guide the whole class to discuss whether the questions compiled by children meet the three conditions of compiling questions, and then let the whole class use digital cards to calculate formulas and answer application questions.
Application problem is to describe relevant facts in language or words and reflect some mathematical relationship (such as quantitative relationship, positional relationship, etc.) ) and solved an unknown number of problems. Each application problem includes known conditions and problems. In the past, China's application problems usually required narrative to meet three requirements: no contradiction, that is, conditions and problems could not be contradictory; Completeness, that is, the condition must be sufficient to ensure that the value of the unknown quantity can be obtained from the condition; Independence, that is, several known conditions cannot be deduced from each other. Mathematics application problems in primary schools are usually divided into two categories: simple application problems that can be solved in one step only by addition, subtraction, multiplication and division; Complex application problems that need two or more operations to solve.