第4课时数的顺序.ppt

第,4,课时 数的顺序,R,一年级下册,学习目标,1.,通过填写百数表，了解,100,以内数的顺序，构建数与数之间的关系2.,通过观察、分析百数表，探究,100,以内数，培养学生探究的兴趣，发展学生的思维学习重点,掌握,100,以内的排列顺序一、复习导入,12,14,16,18,20,22,33,44,55,66,77,88,99,28,37,46,64,73,82,91,上节课我们学习了,100,以内的数，请任选几个数读一读写一写你能帮助这些数排好队吗？,这节课我们就来学习数的顺序看看它们排好队后会带给我们什么惊喜吧二、自主探究,按照数的顺序，在空格里填数2,4,6,8,10,11,13,15,17,19,22,28,33,37,44,46,55,64,66,73,77,82,88,91,99,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,2,4,6,8,10,11,13,15,17,19,22,28,33,37,44,46,55,64,66,73,77,82,88,91,99,二、自主探究,按照数的顺序，在空格里填数。

1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,二、自主探究,按照数的顺序，在空格里填数。

你发现了什么？,十位是,3,的一行数涂上绿色除,40,以外，其他数的十位上都是,3,，个位上的数依次多,1,你还发现了什么？,横着看，第,2,行的前,9,个数十位上都是,1,，第三行,每一行（除最后一个数）十位上的数相同，后一个数总比前一个数多,1,按照数的顺序，在空格里填数1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,你发现了什么？,个位是,3,的数涂上黄色这些数个位上的数相同，下面一个数总比上一个数多,10,你还发现了什么？,竖着看，第,1,列的个位上都是,1,，第,2,列,观察每一列数，发现排列规律与第,3,列式一样的，都是个位上的数相同，上下相邻的两个数相差,10,。

按照数的顺序，在空格里填数1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,你还能从表中发现哪些有趣的排列？,按照数的顺序，在空格里填数1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,个位和十位数字相同的数涂上红色。

斜着看，从,11,到,99,，这一组数十位上的数和个位上的数相同按照数的顺序，在空格里填数1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,从,19,到,91,，这一组数十位上的数依次多,1,，个位上的数依次少,1,小结,每一,行,（除最后一个数）十位上的数,相同,，后一个数总比前一个数,多,1,每一,列,数都是个位上的数,相同,，上下相邻的两个数,相差,10,01,02,小结,斜着看，从,11,到,99,，这一组数十位上的数和个位上的数,相同,；从,19,到,91,，这一组数十位上的数依次,多,1,，个位上的数依次,少,1,03,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,第,4,行第,8,个数是多少？第,5,行第,8,个数是多少？,38,48,三、达标检测,1.,猜一猜。

1,）百数表中，第,3,行第,5,个数是（,）2,）有一个数，在百数表的第,6,行第,7,列，它是（,）3,）一个数的个位和十位上的数是,5,，这个数是（,）4,）与,89,相邻的两个数是（,）和（,）25,57,55,90,88,2.,填出空格中的数四、巩固提升,按照例题中的表的排列，在下面的空格中填上适当的数28,38,39,29,45,35,44,46,55,45,44,43,53,63,54,五、课堂小结,数 的 顺 序,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,六、课后作业,1.,从课后习题中选取；,2.,完成练习册本课时的习题。

七、教学反思,在百数表中，藏着许多有趣的数的排列在教学中，让学生从不同角度仔细观察，发现这些数的排列特点并表达出来，同时根据百数表回答问题，对培养学生的观察能力以及发现问题和解决问题的能力有了很大的帮助。