工程问题也叫工作问题,对于小学生来说是比较抽象的。在这种复合的分数应用题里反映的还是整数应用题中学过的数量关系,但学生在学习时仍不易理解它的解法,往往感到辣手,其症结所在是没有把总工程看作“1”,导致无从下手。因此,在教学工程问题时,首先要讲清工程问题中的一些基本概念和数量关系,即工作总量、工作效率和工作时间关系,但是带有分数的特点。 Engineering problem is also called work problem, which is more abstract for primary school students. In this composite fractional application questions reflect the relationship between the number of integer application problems, but students are still not easy to understand when learning its solution, often feel hot, the crux of the problem is not the total project as a “1” , Resulting in no start. Therefore, in the teaching of engineering problems, we must first clarify some of the basic concepts and the quantitative relationship between engineering problems, namely the total amount of work, work efficiency and working hours, but with the characteristics of scores.