在教学量角器的认识和使用时,我发现学生的量角器五花八门,这给我的教学带来了不少难度。在学习了怎样量角之后,我让学生尝试练习,量一量书上给定角的度数。结果让我大跌眼镜,学生们量的角的度数有不少出现了误差。于是我走到学生中间,看看到底是由于什么原因造成的。在巡视了一圈之后,我发现农村孩子所使用的量角器各不相同。是的,这不是学生的错。农村里没有一家正规的文具店,没有统 In the teaching of protractor awareness and use, I found that students have a variety of protractor, which brought a lot of teaching my difficulty. After learning how to measure the horns, I asked the students to try practicing a few degrees on a given book. As a result, I was amazed by the fact that many of the degrees of the students were in error. So I went to the middle of the students and see exactly what caused it. After a circle of visits, I found that the protractors used by rural children differed. Yes, this is not a student’s fault. There is no formal stationery shop in rural areas, there is no system