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“角的分类”是新人教版数学四年级上册第三单元的内容。它是在学生初步认识角,会用量角器量角的基础上进行教学的。教材借助两把折扇的实物素材认识平角和周角。通过观察、动手实践、探究等活动,让学生掌握锐角、直角、钝角、平角、周角之间的关系,让他们感受到数学学习内容是现实的、有意义的。考虑到分类这一现象在生活中到处可见,把学习建立在学生原有的生活和经验基础上,让数学带上生活味,能充分调动学生的积
“Angle classification ” is the content of the third unit of the fourth edition of the New Year mathematics books. It is the initial recognition of students in the corner, will use the protractor angle of the basis of teaching. Textbook With the help of two folding fans in-kind material understanding of the angle and angle. Through observation, hands-on practice, inquiry and other activities, students should grasp the relationship between acute angle, right angle, obtuse angle, flat angle and perimeter angle so that they can feel that the content of mathematics learning is realistic and meaningful. Taking into account the classification of this phenomenon can be seen everywhere in life, based on the learning of students based on the original life and experience, to bring the taste of mathematics life, students can fully mobilize the plot