一、引预自探(一)问题情境探究1.搜集家中的药盒,看看它们都有几个面?这些面形状一样吗?大小一样吗?观察后写出自己的观察所得。(观察、记录、写感受)2.小张同学的床有20张大纸,小李同学的床也有20张大纸,由此说这两张床一样大,对吗?(先独立思考,再与家长讨论)3.制作边长是1分米的正方形,用它量一量一页挂历有多少个这样的正方形那么大?量时你有什么感受?(操作和初步感受用平方分米量) First, the pre-intervention self-exploration (A) to explore the problem context 1. Collect the kit at home to see how many of them have a face? These faces the same shape? The same size? Observations, write your own observations. (Observation, record, write feelings) 2 Zhang’s bed has 20 large sheets of paper, Xiao Li’s bed also has 20 large paper, which said that these two beds as large, right? (First independent thinking, and then Parents discussion) 3. Making a side length of 1 meter square, with the amount of one page of the number of such a square wall calendar so much? How do you feel when the amount? (Operating and initial experience with the amount of square decimeter)