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一、缘起在一次教学流程检查中,有这么一道题(浙江教育出版社出版的人教版教材配套使用作业本六下42页):为庆祝元旦,三(1)班同学做小红旗(如图)(图是一个腰为2分米的等腰直角三角形)。现在有一张长1.4m、宽0.9m的长方形卡纸,最多可以做这样的小红旗多少面?大部分学生是这样解答的:1.4米=14分米,0.9米=9分米,14÷2=7(个),9÷2=4(个)……1(分米),7×4×2=56(面)。答:最多可以做这样的小红旗56面。教师对此种解法的批改是一个大大的“√”。也有小部分学生解答为:1.4米=14分米,
First, the origin of a teaching process check, there is such a problem (Zhejiang Education Publishing House PEP teaching materials supporting the use of homework six under 42): In celebration of New Year’s Day, three (1) classmates make a small red flag (The figure is a isosceles right-angled triangle with a waist of 2 m). Now there is a rectangular 1.4m, 0.9m wide rectangular cardboard, can do such a little red face? Most students answer this way: 1.4 meters = 14 decimeter, 0.9 meters = 9 decimeter, 14 ÷ 2 = 7 pieces, 9/2 = 4 pieces ... 1 decimeter, 7x4x2 = 56 pieces. A: You can do such a small red face 56. Teachers’ amendment of this solution is a big “√”. There are also a small number of students to answer as follows: 1.4 meters = 14 decimeters,