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求平均数应用题,实质上就是在总数不变的条件下使几个数由不等转化为相等。教学求平均数应用题目的不仅是使学生会解这类题,更重要的是启发诱导学生思考这种转化的道理,探求转化的规律和方法。我是这样做的: 一、直观演示,揭示规律在讲例题前,我请四个同学到讲台来,分别分给他们3支、4支、7支、6支铅笔,问:怎样才能使他们的铅笔相等?学生经过思考,想出很多方法,有的先算出总数再等分,算式为(3+4+7+6)÷4;有的先以最
The average number of application questions, in essence, is to keep a few numbers from equal to equal under the condition of a constant total number. Teaching the average number of application topics is not only to enable students to solve such questions, more importantly, to inspire students to think about this transformation of the truth, to explore the rules and methods of conversion. I did this: I. Visual Demonstration and Reveal the Laws Before the sample questions, I asked four classmates to come to the podium and give them three, four, seven and six pencils respectively. Q: How can I make them Pencil equal? Students after thinking, come up with many ways, and some calculate the total number of second and then divided, the formula is (3 +4 +7 +6) ÷ 4; some first to the most