《数学课程标准》在课程实施建议中明确指出:数学教学要求紧密联系学生的生活实际,从学生的生活经验和已有知识出发,创设各种情境,为学生提供从事数学活动的机会,激发对数学的兴趣以及学好数学的愿望。建构主义学习理论也认为:学习是学生主动的建构活动。学习应与一定的情境相联系,在实际情境下进行教学,可以使学生利用原有的知识和经验同化当前要学习的新知识,这样获取的新知识不但便于保持,而且容易进入迁移创新的情境中。现代教学 The mathematics curriculum standard clearly pointed out in the curriculum implementation suggestion that the mathematics teaching requires to closely relate students ’life reality, to create situations from students’ life experience and existing knowledge, to provide students with the opportunity to engage in math activities, Math interests and the desire to learn mathematics. Constructivism learning theory also believes that: learning is the active construction activities of students. Learning should be associated with a certain situation, teaching in the actual situation, can make students use the existing knowledge and experience to assimilate the current knowledge to be learned, so that new knowledge acquired not only easy to maintain, but also easy to enter the context of the transfer of innovation in. Modern teaching