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教学《质数、合数》可分三个层次进行。观察概括建立概念观察思考,揭示规律:要求学生写出1——12各数的约数,教师依次板书在黑板上,然后指导学生观察、思考:2、3、5、7、11等数的约数有什么特征?(只有1和它本身两个)2、4、6、89、10、12等数的约数又有什么特征?(除了1和它本身外,还有别的约数,至少有三个约数) 抽象概括,建立概括:指导学生阅读p.37质
Teaching “prime numbers, combined number” can be divided into three levels. Observe the general observation to establish the concept of observation, revealing the law: require students to write out the approximate number of 1-12 each, the teacher in turn blackboard on the board, and then guide the students to observe and think: 2,3,5,7,11 equal What are the characteristics of the divisors? (Only 1 and itself?) What are the divisors of divisors 2,4,6,89,10,12? (In addition to 1 and itself, there are other divisors , At least three divisors) Abstraction, generalization: Instruct students to read p.37