There is no multiple problem in the second-grade mathematics textbook of Jiangsu Education Press, and the knowledge point in the second-volume mathematics textbook of fourth grade is "multiple and factor". The teaching objectives are as follows:

1, let students understand the meaning of multiples and factors, master the method of finding multiples and factors of a number, and find the characteristics of multiples, maximum numbers, minimum numbers and numbers of a number.

2. Let students initially realize that we can study the characteristics of non-zero natural numbers and their relationships from a new angle, cultivate students' abilities of observation, analysis and abstract generalization, experience the wonder and interest of mathematics content, and generate curiosity about mathematics.

Teaching emphases and difficulties:

Find the multiples and factors of a number, and find the multiples, maximum numbers, minimum numbers and their characteristics of a number.

Reference to the above content: Baidu Encyclopedia-Multiply