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在讲“商不变的性质”时,我给小朋友讲了这样一个故事:过去有一只聪明的小猴子,它的主人拿桃子喂它,并跟它商量供应的数量。主人问它:“一顿给你三个行吗?”(老师随手板书“3”“1”两个数)小猴子摇摇头。主人再问:“两顿给你六个行吗?”(板书“6”“2”),小猴子又摇摇头,主人又问:“那三顿给你九个够了吧?!”(板书“9”“3”),小猴子还是摇摇头。小朋友想一想,主人答应三顿给他九个桃子,小猴子为什么还不满意呢?儿童经过思考找出原因;虽然桃子数扩大了二倍、三倍,但顿数也跟着扩大了二倍、三倍,而每顿吃的桃子数还是没变(每顿三个)。这时老师在板书“3、
In talking about the “invariable nature of business,” I told the story of a child: In the past there was a clever little monkey whose owner fed it with peaches and advised him about the quantity supplied. The owner asks: “Does one meal give you three?” (Teacher reads “3” “1” with two numbers) The monkey shook his head. The owner asks again: “Do you have six meals for you?” (6 “2”), the monkey shook his head again and the owner asks, “Is that three meals enough for you ?!” Blackboard “9” “3”), the monkey still shook his head. Children think about it, the owner promised three to give him nine peaches, the monkey why not satisfied? Children after thinking to find out the reason; although the number of peaches expanded by two times, but also followed by the expansion has tripled , Three times, and the number of peaches per meal has not changed (three per meal). At this time the teacher in the blackboard "3,