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在分数除法教学中,除数是分数的教学既是重点,又是难点。为什么一个数除以分数,等于这个数乘以原分数的倒数?为什么一个数除以真分数其商变大?学生理解起来较困难。关于第一个问题,教材在分数乘法中,已介绍了“乘积是1的两个数互为倒数”的概念,只要学生理解了这个概念,就可以利用商的变化规律来教学分数除法的法则了。
In the teaching of fractional division, the teaching of divisor is the key points, but also difficult. Why a number divided by the number of fractions equal to the number of times the reciprocal of the original fraction? Why a number divided by the true fraction becomes larger? Students understand it more difficult. On the first question, the textbook in the fractional multiplication, has introduced the concept of “the reciprocal of the two numbers of the product is 1”, as long as the students understand the concept, you can use the law of business to teach the rules of fractional division It's