小学生在一、二年级时就学习了整数倍的概念,以后各年级又先后引进小数倍、分数倍(百分率)以及比和比例的概念。为了使学生对这些知识融会贯通,系统化,我们在六年级“比例”一章讲授之后,安排了有关倍数概念的综合训练课。先出示例题:六年级有男生50名,女生80名。(1)求男生人数与女生人数的比。(学生答:50:80=5:8)(2)求男生人数是女生人数 Primary school students in the first and second grade to learn the concept of integer multiples, after all grades have introduced decimal, fractional (percentage) and ratio and the concept of proportion. In order for students to integrate and systematize this knowledge, we arranged a comprehensive training course on the concept of multiples after lecturing in the “Proportion” chapter of the sixth grade. Example first example: sixth grade there are 50 boys and 80 girls. (1) Find the ratio of boys to girls. (A: 50: 80 = 5: 8) (2) The number of boys seeking is the number of girls