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【教学内容】苏教版五年级下册第50、51页。【教学过程】一、分类思考,建立猜想,举例验证师:自然数按是否是2的倍数分为两类,一类是奇数,一类是偶数。怎样快速判断一个数是奇数还是偶数呢?生:个位是1、3、5、7、9的数是奇数,个位是0、2、4、6、8的数是偶数。师:218、213214218、147、847645147哪个是奇数哪个是偶数?师:看来判断一个数是奇数
Teaching content】 【Soviet version of the fifth grade volumes 50, 51 pages. Teaching process A classification of thinking, the establishment of conjectures, for example Verifier: natural number is divided by 2 is divided into two categories, one is odd, one is even. How to quickly determine whether a number is odd or even? Health: a digit is 1, 3, 5, 7, 9 is an odd number, a digit is 0, 2, 4, 6, 8 is an even number. Teacher: 218,213214218,147,847645147 Which is an odd number which is even? Teacher: It seems to judge a number is odd