People's Education Edition, pages 68-69. Common multiples are learned in the fifth grade. Page 68-69 of the textbook for compulsory education in the fifth grade of People's Education Press, the teaching goal is to understand and understand the meaning of common multiple and minimum common multiple, and express the multiple and common multiple of two numbers with set diagram. Learning common multiples also requires familiarity with basic integer operation rules, such as addition, subtraction, multiplication and division. When solving practical problems, it is also important to understand the application scenarios of common multiples.