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【课前思考】《义务教育数学课程标准(2011年版)》对“问题解决”教学提出了分阶段目标要求,第一阶段目标是:“在教师的指导下,从日常生活中发现和提出简单的数学问题,并尝试解决;了解分析问题和解决问题的一些基本方法,知道同一个问题可以有不同的解决方法;体验与他人合作交流解决问题的过程。”“两步计算解决问题”是二年级下册数学课本第五单元“混合运算”安排的教学内容,这是二年级学生第一次接触此类问题。教学时,应着重让学生
[Thinking before class] “Mathematical Curriculum Standard for Compulsory Education (2011 Edition)” on “problem solving ” teaching put forward the phased objectives and requirements, the first phase of the goal is: “Under the guidance of the teacher, found in daily life And put forward simple mathematical problems and try to solve them; understand some basic methods of analyzing and solving problems; know that the same problem can have different solutions; and experience the process of collaborating with others to exchange and solve problems. ”“ Solving Problems ”is the second unit of mathematics textbook Unit 5 “ mixed computing ”teaching content, which is the first contact with sophomores students such issues. Teaching, should focus on students