练习是教学的一个重要组成部分,练习是掌握知识,形成技能,发展能力的重要途径。在课堂教学中,教学的效度(效果、效率、效益)与练习因素有很大的关联,恰到好处的练习可以有效地巩固知识,提高智力和思维能力。如何设计合适的练习,以减轻学生负担、提高教学质量,是每个一线教师应关注与研究的问题。本文试以“百分数的意义”习题剖析为例,谈谈如何使练习的设计与应用更高效。 Practice is an important part of teaching practice is an important way to master knowledge, form skills and develop abilities. In classroom teaching, the effectiveness of teaching (effectiveness, efficiency, effectiveness) and practice factors have a great relationship, just to practice can effectively consolidate knowledge, improve intelligence and thinking ability. How to design suitable exercises to reduce the burden on students and improve the quality of teaching is that each front-line teacher should pay attention to and study the issue. This article attempts to “% of the significance of” exercises as an example, to talk about how to make the practice of the design and application more efficient.