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初步建构数学模型思想是数学课程标准的要求之一,依据小学生的认知规律,“数射线”成为帮助学生建立“数概念”的适切载体。“数射线”(见下图)是数轴的正半轴,学生在小学第一学段就开始接触。实际教学时是利用“数射线”——数轴的正半轴部分进行“数的认识”及“运算中的算理理解”。本文将对沪教版教材中的“数射线”内容进行梳理,对利用“数射线”进行“数与代数”教学
The idea of constructing mathematical model is one of the requirements of mathematics curriculum standard. Based on the cognitive law of primary school students, “number ray” becomes a proper carrier to help students to establish “number concept”. “The number of rays ” (see below) is the positive semi-axis of the number of axes, students in the first semester of primary school began to touch. The actual teaching is the use of “number of rays ” - the positive half-axis part of the number of “number of recognition ” and “arithmetic operation understanding ”. This article will sort out the content of “number ray” in the textbook of Shanghai Education Press, and teach “Number and Algebra” using “number ray”