根据以往的教学经验,在教完“面积”概念后,小学生往往会对“面积与周长”两个概念搞不清,面积单位和长度单位乱用。因此,新课教完后,我设计了一堂活动课,引导学生对“面积与周长”的联系进行讨论与思考。课前准备:学生每人一个装有小正方形的信封,每人一根长20cm的铁丝,一长方格纸、多媒体课件一套。 According to the teaching experience in the past, after completing the concept of “area”, primary school students often find it unclear about the concepts of “area and perimeter”, and make indiscriminate use of area units and length units. Therefore, after completing the new lesson, I designed an activity class to guide students to discuss and think about the relationship between “area and circumference”. Pre-class preparation: Students each with a small square envelope, a length of 20cm per person wire, a long grid of paper, a set of multimedia courseware.