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【教学内容】浙教版四年级下册第18、19页。【教学过程】一、巧借方块,引入课题1.引入。师:用12个小正方形拼摆成长方形,有几种不同的摆法?你是怎么想的?2.汇报。方法一:每行12个,可排1行;每行1个,可排12行。方法二:每行6个,可排2行;每行2个,可排6行。方法三:每行4个,可排3行;每行3个,可排4行。3.理清。(1)以第三种摆法为例,3×4=12,3是12的因数,4是12的因数,3和4都是12的因数。
【Teaching content】 Zhejiang Education Publishing House fourth grade volumes 18,19 pages. 【Teaching process】 One, clever by box, the introduction of the subject 1. Introduction. Teacher: There are several different pendulum patterns with 12 square squares, how do you think? Method one: 12 per row, row 1 row; 1 row per row, row 12 rows. Method two: six per row, row 2; each row 2, row 6 rows. Method three: four per row, row 3; row 3, row 4 rows. 3. Clear up. (1) Take the third pendulum method as an example, 3 × 4 = 12, 3 is a factor of 12, 4 is a factor of 12, and 3 and 4 are both 12 factors.