论文部分内容阅读
比较是一种重要的数学思考方法。苏联著名教育家乌申斯基说:“比较是一切理解和思维的基础。我们正是通过比较来了解世界上的一切的。”本文结合小学数学教学浅谈比较方法的应用。 一、变式比较,找准共同点 为形成准确清晰的数学概念,通过变式比较,找准感知对象的共同点,认识其本质属性。如教学发芽率概念时,可出示下面变式题组: (1)某县种子推广站,用300粒种子作发芽试验,结果发芽的种子有288粒。求发芽率。 (2)某县种子推广站,用300粒种子作发芽试验,结果有12粒没发芽。求发芽率。 (3)某县种子推广站作发芽试验,有288粒发芽,12粒没发芽。求发芽率。 进行计算方法的求同比较:
Comparison is an important mathematical thinking. Ussinsky, a famous Soviet educator, said: “Comparisons are the basis of all understanding and thinking, and it is through comparison that we understand everything in the world.” This article combines the application of comparative methods in elementary mathematics teaching. First, the comparison of variables, identify common ground To form a clear and accurate mathematical concepts, through the comparison of variants, identify the commonalities of perceived objects, recognize their essential attributes. Such as the concept of teaching germination rate, can produce the following variants of the group: (1) a county seed promotion station, with 300 seeds for germination test, the results of 288 seeds germinated. Seeking germination rate. (2) A county seed promotion station, with 300 seeds for germination test, the results of 12 did not germinate. Seeking germination rate. (3) A county seed promotion station for germination test, 288 germination, 12 did not germinate. Seeking germination rate. Comparisons of calculation methods: