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国标本(苏教版)小学数学第五册第一单元中有这样一题:“小华3分钟跳绳267下,小红2分钟跳绳194下。估计一下,谁跳得快一些?”为了设置认知冲突,激发学生的学习兴趣,教学中我对教材进行了适当的处理。一、猜一猜师:大家都会跳绳吗?如果男、女生比赛,猜猜看谁跳得快?男生:我们力气大,我们跳得快。女生:我们跳得多,因为我们女生比你们会跳。师:非常好!大家对自己充满信心,都在极力地表现自己跳得快。还有的同学根据平时课间活动中大家跳绳的多少来判断,但这
The national standard (Sujiao Edition) elementary school mathematics fifth unit in the first unit has such a question: “Xiaohua 3 minutes jump rope 267, red 2 minutes skipping 194. Estimate, who jump faster?” In order to set the cognitive conflict, to stimulate students’ interest in learning, I teach the teaching materials in an appropriate manner. First, guess the division: we will jump rope? If male, female competition, guess who jump too fast? Boy: We are great, we jump too fast. Girls: We dance much because we girls will jump more than you. Teacher: Very good! Everyone is full of confidence in themselves, are strongly trying to show that they jump too fast. There are students according to the usual class activities, how many rope skipping to judge, but this