化简比和求比值是解答比和比例应用题的基础,是学生很容易混淆的两个概念,学好这部分知识对于比和比例这一章具有重要意义。在教学中我通过联系分数的相关知识,应用对比法有效突出了章节重点、突破了学生容易混淆这一难点。下面就如何使用对比方法教好这部分知识谈谈自己粗浅的体会,供大家在教学中参考。一、从概念上对比比值是比的前项除以后项所得的商,要使学生弄清楚“比值”是一个 Simplification ratio and the ratio is the answer to the ratio and the proportion of application questions based on the two concepts are easily confused by students, to learn this part of the knowledge ratio and proportion of this chapter is of great significance. In teaching, I contacted the relevant knowledge of the scores and applied the contrast method to effectively highlight the key points of the chapter, which broke through the difficulty of students being confused. Here’s how to use the contrast method to teach this part of the knowledge to talk about their superficial understanding, for your reference in teaching. First, the conceptual comparison of the ratio is more than the ratio of the preceding term divided by the latter business, to make clear to students “ratio ” is a