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2011年版的《义务教育数学课程标准》要求我们数学教学要重视发展学生的空间观念,但是,如何发展学生的空间观念却很少有教师能清楚地回答出来。比如苏教版小学数学三年级下册《长方形和正方形的面积》单元中“面积单位之间的换算”的教学,许多教师就是按教材中的设计那样,先告诉学生正方形边长是1分米,那么它的面积就是1平方分米,然后再让学生知道1分米等于10厘米,于是这个边长是1分米的正方形面积就是100平方厘米,从而得
The 2011 version of the Compulsory Education Mathematics Curriculum Standard requires that we should attach importance to the development of students ’concept of space in mathematics teaching. However, how to develop the students’ concept of space rarely can be answered clearly by teachers. For example, the Soviet version of elementary school mathematics grade three volumes “rectangular and square area” unit “conversion between units ” teaching, many teachers is teaching materials designed to tell students to square side length is 1 Decimeter, then its area is 1 square decimeter, and then let the students know that 1 decimeter is equal to 10 cm, so the side length is 1 meter square area is 100 square centimeters, which is