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人教版小学数学三年级下册的数学广角《搭配问题》,是通过探讨两件上装和三件下装的不同搭配,找出不同穿衣的组合数。在二年级的学习中,孩子们已经接触了一点排列与组合知识,对衣服搭配、数字的排列有一定的感性认识,但是缺乏有序的思考,无法进行有序的搭配。本节课的内容就是在学生已有知识和经验的基础上,继续让学生通过观察、猜测、实验操作等活动有顺序地找出事物的搭配方法,向学生渗透数学思想,初步培养学生
PEP version of the third grade mathematics under the math wide-angle “collocation problem” is through the discussion of two different types of clothing and three underwear with different, to find out the number of different combinations of clothing. In sophomore learning, children have been exposed to a little bit of permutations and combinations of knowledge, and have some perceptual knowledge of clothing collocation and number arrangement. However, there is a lack of orderly thinking and an orderly collocation. The content of this lesson is based on the students ’existing knowledge and experience, and continue to enable students to find out ways of matching things sequentially through observation, speculation and experimental operation, to infiltrate students’ mathematical thinking and train students