小学数学人教一年级数的顺序--比较大小.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,一、复习,读出下列各数。,35 76,89,90,96 100,2.,口答。,一个两位数，十位上是,5,，个位上是,9,，这个数写作（）,一个数，百位上是,1,，十位、个位都是,0,，这个数写作（）,（三十五）,（七十六）,（八十九）,（九十）,（九十六）,（一百）,59,100,数的顺序,比较大小,黑套小学 金亚芬,教学目标,1.,初步掌握,100,以内数的顺序。,2.,初步会比较,100,以内数的大小。,3.,初步结合具体事物，使同学们 感受,100,以内数的意义，会用,100,以内的数表示日常生活中的事物，并进行简单的估计和交流。,1,13,4,15,6,18,10,按顺序填写。,2,3,5,7,8,9,11,12,14,16,17,19,20,按照数的顺序在空格里填数：,100,98,97,96,95,94,93,92,90,89,87,86,85,84,83,81,80,79,78,76,75,74,72,71,70,69,68,67,65,63,62,61,60,59,58,57,56,54,53,52,51,50,49,48,47,45,43,42,41,40,39,38,36,35,34,32,31,30,29,27,26,25,24,23,21,20,18,16,14,12,9,7,5,3,1,13,2,11,22,33,44,55,66,77,88,99,4,6,8,10,15,17,19,28,37,46,64,73,82,91,1,、给十位是,3,的数涂上绿色；,2,、给个位是,3,的数涂上黄色；,3,、给个位、十位颜色相同的数涂上粉色；,100,98,97,96,95,94,93,92,90,89,87,86,85,84,83,81,80,79,78,76,75,74,72,71,70,69,68,67,65,63,62,61,60,59,58,57,56,54,53,52,51,50,49,48,47,45,43,42,41,40,39,38,36,35,34,32,31,30,29,27,26,25,24,23,21,20,18,16,14,12,9,7,5,3,1,13,2,11,22,33,44,55,66,77,88,99,4,6,8,10,15,17,19,28,37,46,64,73,82,91,你能从表里看出哪些有趣的排列？,横着看，第,2,行的前,9,个数十位上都是,1,，第,3,行,竖着看，第,1,列的个位上都是,1,，第,2,列,第,4,行第,8,个数是多少？第,5,行第,8,个数是,多少？,38,48,28,按照下表中的排列，在下面的空格中填上适当的数。,29,38,39,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,45,按照下表中的排列，在下面的空格中填上适当的数。,35,55,44,46,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,按照下表中的排列，在下面的空格中填上适当的数。,69,68,67,77,87,78,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,42,里面有,4,个十。,37,里面有,3,个十。,42,37,23,和,25,十位上的数相同。,这样的数怎样比较大小呢？,23,25,十位,个位,百位,十位,个位,百位,在里填上,“,”,、,“,”,或,“,=,”,。,29,30,81,18,十位,个位,百位,十位,个位,百位,十位,个位,百位,十位,个位,百位,在里填上,“,”,、,“,”,或,“,=,”,。,41,45,57,56,80,90,98,89,69,79,68,78,百 十 个,百 十 个,（）,（）,75,73,百 十 个,百 十 个,（）,（）,50,40,百 十 个,百 十 个,（）,（）,100,10,本课小结,通过本课的学习，我们已经学会了比较两个两位数大小的一般方法，即先看十位上的数，十位上的数大，这个两位数就大；如果十位上的数相同，再看个位上的数，个位上的数大，这个两位数就大。,