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感知是儿童认识世界的开始,小学生感知能力的发展,直接影响数学知识的学习和运算技能的形成。因此,感知材料是小学数学教学的重要环节。数学的本质是抽象的。正如华罗庚教授指出的那样:“数学的特征在于抽象,能够从众多的现象中抽出更本质的概念来,正是数学的优点。因此不要怕抽象,而可怕的是没有具体内容的抽象。”许多有经验的数学教师为讲解抽象的数学概念,而将丰富的具体实例作为教学的重要组成部分,让学生在认识具体事物的基础上进行抽象,总结出数学的概念和规律来。如有
Perception is the beginning of children's cognition of the world. The development of perceptual ability of pupils directly affects the formation of learning and computing skills of mathematical knowledge. Therefore, perceived material is an important part of elementary mathematics teaching. The essence of mathematics is abstract. As Professor Hua Luogeng pointed out, “Mathematics is characterized by abstraction, and the ability to extract more essential concepts from numerous phenomena is the merit of mathematics, so do not be afraid of abstraction, but horrible is abstraction without concrete content.” Many The experienced mathematics teacher explains the abstract mathematics concept, and takes the rich concrete example as the important part of the teaching. It enables the students to abstract on the basis of understanding the concrete things and summarizes the concepts and laws of mathematics. If any