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数学中充满着矛盾。数学教学是分析矛盾,促成矛盾转化的过程。实现矛盾的转化,把数学知识的规律再现在学生面前,即是把握住教学重点,突破难点。在小学数学教学中运用电教媒体,是揭示数学矛盾,实现矛盾转化的极为有效的方法。一、实现具体和抽象的互相转化。数学知识具有抽象性。教学中要通过提供感性材料把抽象的知识具体化,帮助学生形成概念,理解和掌握抽象的数学知识。用电教媒体可创造条件,使抽象的数学内容具体化,使具体向抽象转化,由感性认识上升到理性认识。如教学7+5时,可用投影片映出图示式问题:7块积木和5块积木合起来共有几块积木?7
Math is full of contradictions. Math teaching is the process of analyzing contradictions and promoting the conversion of contradictions. In order to realize the transformation of contradictions and reproduce the laws of mathematical knowledge before the students, we should grasp the key points of teaching and break through the difficulties. The use of audio-visual media in elementary mathematics teaching is an extremely effective way to reveal math contradictions and achieve contradictory transformation. First, to achieve specific and abstract mutual transformation. Mathematical knowledge is abstract. In teaching, abstract knowledge should be embodied by providing sensual materials to help students form concepts, understand and master abstract mathematical knowledge. Using audiovisual media can create the conditions for materializing abstract math content, transforming concrete into abstractions, and rising from perceptual to rational. Such as teaching 7 +5, the projection film can be used to reflect the graphical problem: 7 blocks and 5 blocks together a total of several blocks 7?