“角和直角”在小学实验课本第五单元中独立出现,并将“角”与“直角”分为两个小节进行教学,暗示我们对此应予重视。这同现行统编五、六年制教材是有所不同的。现行统编教材是把这一内容安排在第四册第六单元“长方形和正方形”中的第二小节,往往使缺乏经验的教师把“角和直角”并在一节课内教学,把“初步认识”变成了“粗步认识”,影响 “Angle and Right Angle” appeared independently in Unit 5 of the Pilot Textbook of Primary Schools. Teaching “Corner” and “Right Angle” into two sections suggested that we should pay more attention to it. This is different from the current compilation of five-year and six-year teaching materials. The current system of educational texts, which is organized in the second subsection of “Rectangles and Squares” in Unit 6 of Volume 4, often enables inexperienced teachers to teach “angle and right angle” in one lesson and “ Preliminary understanding ”has become a“ rough understanding of ”influence