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那是开学伊始,五年级第一节数学课的内容是小数乘整数,为了让学生弄清小数乘整数的意义,我课前做了一个铺垫:一个铅笔盒20元钱,买了5个铅笔盒共多少钱?学生列出算式:20×5。“为什么这样列算式呢?”我好奇地问。其中一个学生是这样回答的:“因为这是求5个铅笔盒的钱。”我顺势提问:“对,是求5个铅笔盒的钱。为什么用乘法而不用除法呢?”我的话音没落,瞬间同学们都举起了手,“老师错了!老师错了!”“错了?”我装出无辜的样子,这时学生更是忍耐不住了,一个个群
That is the beginning of school, the first quarter of fifth grade mathematics lesson is a decimal integer, in order to let students understand the meaning of fractional integer, I made a bedding before class: a pencil case 20 yuan, bought 5 pencils Box Total cost? Students list the formula: 20 × 5. “Why is it so formula? ” I asked curiously. One of the students answered this question: “Because this is the money for five pencil cases. ” My homeopathic question: “Yes, it is money for five pencil cases. Why use multiplication instead of division? ” My voice declines, the students are instantly raised their hands, “The teacher is wrong! The teacher is wrong! ” “Wrong? ” I put on innocent appearance, when the student even more can not endure, One by one