一年级数学下册《数的顺序和比较大小》课件 3分解.ppt

100以内数的认识 比较大小新人教版一年级下册,城南实验学校 晏春芳,绿色圃中小学教育网http:/,13,按照数的顺序在空格里填数:,2,11,22,33,44,55,66,77,88,99,4,6,8,10,15,17,19,28,37,46,64,73,82,91,100 以 内 数 的 顺 序,13,按照数的顺序在空格里填数:,2,11,22,33,44,55,66,77,88,99,4,6,8,10,15,17,19,28,37,46,64,73,82,91,100 以 内 数 的 顺 序,13,按照数的顺序在空格里填数:,2,11,22,33,44,55,66,77,88,99,4,6,8,10,15,17,19,28,37,46,64,73,82,91,100 以 内 数 的 顺 序,13,按照数的顺序在空格里填数:,2,11,22,33,44,55,66,77,88,99,4,6,8,10,15,17,19,28,37,46,64,73,82,91,100 以 内 数 的 顺 序,13,按照数的顺序在空格里填数:,2,11,22,33,44,55,66,77,88,99,4,6,8,10,15,17,19,28,37,46,64,73,82,91,100 以 内 数 的 顺 序,13,按照数的顺序在空格里填数:,2,11,22,33,44,55,66,77,88,99,4,6,8,10,15,17,19,28,37,46,64,73,82,91,100 以 内 数 的 顺 序,13,按照数的顺序在空格里填数:,2,11,22,33,44,55,66,77,88,99,4,6,8,10,15,17,19,28,37,46,64,73,82,91,100 以 内 数 的 顺 序,13,按照数的顺序在空格里填数:,2,11,22,33,44,55,66,77,88,99,4,6,8,10,15,17,19,28,37,46,64,73,82,91,100 以 内 数 的 顺 序,13,按照数的顺序在空格里填数:,2,11,22,33,44,55,66,77,88,99,4,6,8,10,15,17,19,28,37,46,64,73,82,91,100 以 内 数 的 顺 序,13,按照数的顺序在空格里填数:,2,11,22,33,44,55,66,77,88,99,4,6,8,10,15,17,19,28,37,46,64,73,82,91,100 以 内 数 的 顺 序,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,按照数的顺序在空格里填数:,2,11,22,33,44,55,66,77,88,99,4,6,8,10,15,17,19,28,37,46,64,73,82,91,100以内数的顺序,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,给十位是 3 的数涂上绿色,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,给十位是 3 的数涂上绿色,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,给个位是 3 的数涂上红色,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,给个位是 3 的数涂上红色,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,给个位和十位数字相同的数涂上粉色,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,给个位和十位数字相同的数涂上粉色,100,以内数的顺序和比较大小的练习,一、,按照数的顺序填数,。,(1),(2),0 10 ( ) ( ) ( ) 50 ( ) ( )( )( )( ),32,29,28,30,31,33,20,30,40,60,70,80,90,100,189，数位多的数就大。,18,9,他们谁最大呢？,35,绿色圃中小学教育网http:/,比一比，哪只母鸡下蛋多？,左边的母鸡一个月下28个鸡蛋,右边的母鸡一个月下26个鸡蛋,28 26,绿色圃中小学教育网http:/,比较大小的方法,根据数鸡蛋图来比，只看最后一行，最后一行中左边有3个，右边有1个，所以28大于26；,根据数的顺序来比，28在26的后面，所以28大于26；,根据数的组成来比，28是2个十和8个一组成，26是2个十和6个一组成，所以28大于26;,其他方法,绿色圃中小学教育网http:/,百 十 个,百 十 个,2 3,2 4,绿色圃中小学教育网http:/,3 1,3 4,4 0,4 3,绿色圃中小学教育网http:/,2 1,3 2,32,52,3 0,25,发现看看每组的两个数你能什么,两位数比较大小，十位大的就大,绿色圃中小学教育网http:/,比较两个两位数大小的一般方法：,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，就看个位上的数，个位上的数大，则这个两位数就大。,绿色圃中小学教育网http:/,(3),60,?,?,百,十,个,百,十,个,二、练习。,37 32,用手势表示 里应填“”、“”还是“=”？,57 70,18 21,80 78,42 42,=,90 80,3 1,3 4,4 0,4 3,两位数比较大小，十位相同，个位大的就大,2 3,2 4,发现看看每组的两个数你能什么,绿色圃中小学教育网http:/,做一做 P39,在 里填上“”、“”、或“=”。,48 45 57 56 68 78 80 90 69 69 98 89,=,绿色圃中小学教育网http:/,思考题 P39,把卡片正确地放在 里。,38,58,60,79,98,38,60,79,58,98,绿色圃中小学教育网http:/,52 72 4648 70 86,12 36 50 98,小朋友，你们好，你知道我是谁吗？,14,绿色圃中小学教育网http:/,(1)正方形里最大的数是我,我是.,小朋友，你们好，你知道我是谁吗？,98,绿色圃中小学教育网http:/,12 36 50 98,14,52 72 4648 70 86,(1)正方形里最大的数是我,我是.,小朋友，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,绿色圃中小学教育网http:/,12 36 50 98,14,52 72 4648 70 86,(1)正方形里最大的数是我,我是.,小朋友，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,绿色圃中小学教育网http:/,12 36 50 98,14,52 72 4648 70 86,(1)正方形里最大的数是我,我是.,小朋友，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,绿色圃中小学教育网http:/,总结：,这节课你们学会了什么？,比较两个两位数的大小以及方法十位不同看（ ）位，十位数字大的数就大；十位相同看（ ）位，个位数字大的数就大。,十,个,绿色圃中小学教育网http:/,100以内数的认识,再见了, 比较大小,绿色圃中小学教育网http:/,