【课例】小学六年级《长方体表面积计算》 (准备:全班分9个小组,每一小组发至少10个空火柴盒。) 师:同学们,你们知道老师给你们这么多火柴盒做什么用吗? (生猜测。) 师:同学们,我想请大家当一回设计师,给火柴盒设计包装方案。出题:长方体一只火柴盒,长4.5厘米,宽3.7厘米,高1.3厘米。把10只火柴盒包在一起形成一个大长方体,现称之为一条。可以怎样包装?算一算一条火柴盒需要多少大的包装纸(包装纸重叠部分忽略 【Lesson】 Primary sixth grade “Cuboid surface area calculation” (Preparation: The whole class is divided into 9 groups with at least 10 empty matchboxes for each group.) Teacher: Classmates, you know what the teacher gave you so many matchboxes Teacher: Students, I would like to invite everyone to be a designer, to match the box design package. A: a rectangular box, 4.5 cm long, 3.7 cm wide, 1.3 cm high. The 10 matchbox wrapped together to form a large rectangular, now called one. How can I pack it? How many large wrappers do you need to count a matchbox (wrapping overlap is ignored