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“分米的认识”是人教版数学三年级上册第23页的教学内容,是在学生对长度单位米、厘米、毫米有了充分认识的基础上进行教学的。教材要求学生通过观察米尺,用手势表示出10厘米的长度,获取10厘米就是1分米这一数学信息;知道在测量物体的长度时有时也用分米(dm)做单位。了解分米与厘米、分米与米之间的进率,会进行简单的单位换算;并能选择用分米做单位进行测量,从而建立1分米的长度观念。一、动手操作,帮助学生建立1分米的长度观念按照《义务教育数学课程标准(2011版)》提出的“结合生活实际,经历用不同方式测量物体
”Understanding of the decimeter “ is the teaching content of PEP 23 in the third grade of the PEP, which is based on the students’ full understanding of the length units of meters, centimeters and millimeters. Textbooks require students to observe by measuring the ruler, using gestures to show the length of 10 cm, 10 cm is 1 meter to obtain this mathematical information; know the length of the object is sometimes measured in dm (dm) as a unit. Understanding decimetances and centimeters, decay and the rate of rice between will be a simple unit conversion; and can choose to do the measurement unit of decimeter to establish the concept of length of 1 decimeter. First, hands-on operation to help students establish the concept of 1-meter-long According to ”compulsory education mathematics curriculum standards (2011 version)“ proposed ”with the actual life experience through different ways to measure objects