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一、第一次教学(片段)黑板呈现思考题:3、7、9三个数组成两位数乘一位数,乘积最大是多少?乘积最小呢?师:从题中你能获取哪些关键点?生:必须是两位数乘一位数。生:乘积最大,乘积最小,不是数字最大,最小。问:看了题目你还有什么疑问?生:一道算式中能用2次9吗?能不用3吗?师:不能,一道算式中每个数字只能用一次,不能重复用。师:想要乘积最大,必须考虑谁与谁
First, the first teaching (fragment) Blackboard presents thinking questions: 3,7,9 three-digit array of two-digit by a single digit, the product is the largest number? The smallest product? Teacher: What you can get from the title Health: must be double-digit by one digit. Health: The largest product, the smallest product, not the largest number, the smallest. Q: Do you have any doubts after reading the topic? Students: Can you use 2 times 9 in a formula? Can you use 3? Teacher: No, each figure in a calculation formula can only be used once and can not be used repeatedly. Teacher: Who wants to consider who wants the greatest product