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在教学“找两个数的最大公因数”后,教材安排了一个“做一做——找出下列每组数的最大公因数,做完后你有什么发现?”目的在于让学生熟练掌握求两个数的最大公因数的方法,同时能快速地找出有特殊关系的两个数的最大公因数。为了顺利地完成教学目标,笔者设计了一组练习:分别找出每组数的最大公因数28和32、60和45、15和16、1和49、8和32、13和26。
After teaching “Find the greatest common divisor of two numbers,” the textbook has a “do one thing - find out the greatest common divisor for each of the following numbers, what do you find out after that?” The goal is to Let students master the method of finding the greatest common divisor of two numbers, and at the same time, quickly find the greatest common divisor of two numbers with special relations. In order to successfully accomplish the teaching goal, the author designed a set of exercises: Find the greatest common divisor of each group of numbers 28 and 32, 60 and 45, 15 and 16, 1 and 49, 8 and 32, 13 and 26, respectively.