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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,*,本资料仅供参考，不能作为科学依据。谢谢。本资料仅供参考，不能作为科学依据。本资料仅供参考，不能作为科学依据。谢谢。不能作为科学依据。,100以内数次序和比较大小,1/31,1一个数十位上是8，个位上是5，,这个数是几？,2一个数百位上是1，十位和个位,都是0，这个数是几？,368里,“6”在（）位上，表示（）个（）；,“8”在（）位上，表示（）个（）。,49是（）位数，82是（）位数，,100是（）位数。,复习提问,2/31,13,2,11,22,33,44,55,66,88,99,4,6,8,10,15,17,19,28,37,46,64,73,82,91,100,以内数次序,新课讲解,3/31,13,2,11,22,33,44,55,66,88,99,4,6,8,10,15,17,19,28,37,46,64,73,82,91,100,以内数次序,看到第一行几个数，是一位数还是两位数？,是单数还是双数？,9和10有个特殊身份，你知道吗？,1,9,7,5,3,新课讲解,4/31,13,2,11,22,33,44,55,66,88,99,4,6,8,10,15,17,19,28,37,46,64,73,82,91,100,以内数次序,看到第二行几个数，是一位数还是两位数？,是单数还是双数？,12,20,18,16,14,新课讲解,5/31,13,2,11,22,33,44,55,66,88,99,4,6,8,10,15,17,19,28,37,46,64,73,82,91,100,以内数次序,看看这些数有什么特点？少了哪一个数？,77,这些数个位上和十位上表示意思相同吗？,新课讲解,6/31,13,2,11,22,33,44,55,66,88,99,4,6,8,10,15,17,19,28,37,46,6,4,73,82,91,100,以内数次序,看看这些数有什么特点？,新课讲解,7/31,13,2,11,22,33,44,55,66,88,99,4,6,8,10,15,17,19,28,37,46,64,73,82,91,100,以内数次序,按照数次序在空格里填数:,新课讲解,8/31,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,按照数次序在空格里填数:,100,以内数次序,给十位是3数涂上绿色；,给个位是3数涂上黄色；,给个位和十位数字相同数涂上粉色。,新课讲解,9/31,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,100,以内数次序,给十位是3数涂上绿色；,返回,这些数改变规律是怎样？,新课讲解,10/31,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,100,以内数次序,给个位是3数涂上黄色；,返回,这些数改变规律是怎样？,新课讲解,11/31,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,100,以内数次序,给个位和十位数字相同数涂上粉色。,返回,这些数改变规律是怎样？,新课讲解,12/31,1、说出100以内十位上是8全部两位数。,2、说出100以内个位上是6数。,3、说出100以内个位与十位相同全部两位数。,4、说出十位与个位之和是10全部两位数,80、81、82、83、84、85、86、87、88、89,6、16、26、36、46、56、66、76、86、96,11、22、33、44、55、66、77、88、99,19、28、37、46、55、64、73、82、91,练习巩固,13/31,依据右表，把下,图中缺数填上。,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,15,16,25,26,练习巩固,14/31,依据右表，把下,图中缺数填上。,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,23,13,33,22,24,练习巩固,15/31,28,26,十位相同，个位大数大。,16/31,百,个,十,百,个,十,3,9,4,5,十位不相同，十位大数大。,17/31,百,个,十,百,个,十,3,2,3,0,18/31,总结：,位数相同，先比十位，十位上数大就大；,十位相同，再比个位，个位上数大就大。,19/31,二、练习。,37 32,在 里应填,“”、“”,还是,“=”？,练习巩固,20/31,57 70,”、“”,还是,“=”？,21/31,18 21,”、“,练习巩固,在 里应填,“”、“”、“,练习巩固,在 里应填,“”、“”,还是,“=”？,25/31,52 72,46,48,70 86,12,36 50,98,儿童，你们好，你知道我是谁吗？,14,26/31,12,36 50,98,14,52 72,46,48,70 86,(1)正方形里最大数是我,我是,.,儿童，你们好，你知道我是谁吗？,98,27/31,12,36 50,98,14,52 72,46,48,70 86,(1)正方形里最大数是我,我是,.,儿童，你们好，你知道我是谁吗？,(2)我在圆和三角形里,比80大,我是,.,98,86,28/31,12,36 50,98,14,52 72,46,48,70 86,(1)正方形里最大数是我,我是,.,儿童，你们好，你知道我是谁吗？,(2)我在圆和三角形里,比80大,我是,.,(3)我在正方形,圆和三角形里,我是,.,98,70,86,29/31,12,36 50,98,14,52 72,46,48,70 86,(1)正方形里最大数是我,我是,.,儿童，你们好，你知道我是谁吗？,(2)我在圆和三角形里,比80大,我是,.,(3)我在正方形,圆和三角形里,我是,.,(4)我在正方形和圆里,比50小,我是,.,98,70,86,48,30/31,本课小结,经过本课学习，我们已经学会了比较两个两位数大小普通方法，即先看十位上数，十位上数大，这个两位数就大；假如十位上数相同，再看个位上数，个位上数大，这个两位数就大。,31/31,
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