“量的计量”是小学数学知识体系的重要组成部分,而长度、面积与体积等几何计量知识又是其中最重要的内容。学生在使用几何计量单位时,常表现出概念不清、进率不明、相互混淆,有的学生常把“米”当成路面面积的单位,把“平方米”当作操场填土量的单位;在计算时常有“某人身高1.2分米、水桶容积40.2平方米、桌面面积O.8平方厘米”的笑 “Measurement of quantity” is an important part of elementary mathematics knowledge system, and geometry measurement knowledge of length, area and volume are the most important contents among them. When students use geometric units of measurement, they often show unclear concepts, unknown rates, and confusion with each other. Some students often regard “meters” as the unit of pavement area and “square meters” as the unit of playground filling volume. In the calculation often “someone 1.2 meters tall, bucket volume 40.2 square meters, desk area O. 8 square centimeters” laugh