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计算教学是小学低段数学教学的“重头戏”。小学低年级学生较依赖于直观形象,这决定了抽象的计算教学离不开几何直观这一“脚手架”。然而,思考是数学的根。运用几何直观,最终是为了促进学生内在的数学思考。笔者认为,在低年级计算教学中,要从促进数学思考的高度出发,审视并改进几何直观教学,发挥几何直观的教学辅助功能。一、注意点线结合,讲究过程思考案例描述:教学人教版一年级上册“加法的初步认识”时,出示松鼠图,让学生根据画面用“先……又……合起来一共……”句式进行描述后,让学生把刚才的过程用○画下来,再列出算式,解释算式的意思,
Calculating teaching is the “main event” of low mathematics teaching in primary school. Lower primary students are more dependent on visual images, which determines the abstract computing teaching can not do without the geometric intuition of this “scaffolding ”. However, thinking is the root of mathematics. The use of geometric intuition, and ultimately to promote students’ internal mathematical thinking. The author believes that in the calculation of low grade teaching, from the perspective of promoting mathematical thinking, review and improve the visual geometry teaching, play a geometric and intuitive teaching support functions. First, pay attention to the combination of point and line, pay attention to the process of thinking Case Description: Teaching PEP first grade on the “preliminary understanding of addition,” show squirrels chart, so that students use the screen according to the “first ...... and ... together ...... ”sentence to describe, let the students just use the process of painting ○, and then list the formula to explain the meaning of the formula,