《数的顺序及比较大小》教学课件.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,*,数的顺序,比较大小,三岔河小学 赵建军,2,4,6,8,10,11,13,15,17,19,22,28,33,37,44,46,55,64,66,73,82,88,91,99,1,3,5,7,9,12,14,16,18,20,21,23,24,25,26,27,29,30,31,32,34,35,36,38,39,40,41,42,43,45,47,48,49,50,51,52,53,54,56,57,58,59,60,61,62,63,65,67,68,69,70,71,72,74,75,76,77,78,79,80,81,83,84,85,86,87,89,90,92,93,94,95,96,97,98,按照数的顺序，在空格里填数。,100,2,4,6,8,10,11,13,15,17,19,22,28,33,37,44,46,55,64,66,73,82,88,91,99,1,3,5,7,9,12,14,16,18,20,21,23,24,25,26,27,29,30,31,32,34,35,36,38,39,40,41,42,43,45,47,48,49,50,51,52,53,54,56,57,58,59,60,61,62,63,65,67,68,69,70,71,72,74,75,76,77,78,79,80,81,83,84,85,86,87,89,90,92,93,94,95,96,97,98,你从表中发现哪,些有趣的排列？,第,5,行第,6,个数是,多少？,77,前面的数是几？,46,76,100,数一数、比一比：,28,26,比一比：,39,45,百 十 个,百 十 个,百 十 个,百 十 个,32,30,39,45,32,30,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，则这个两位数就大。,两位数的比较方法,在 里填上,“,”,“,”,或,“,”,48 45,57 56,61 75,87,87,40 50,98 89,（,1,）上面这组数中最小的数是哪一个？,（,2,）上面这组数中最大的数是哪一个？,（,3,）将它们按照从小到大的顺序排列起来。,23,56,32,44,78,23,78,23,56,32,44,78,把卡片放在小圆圈里：,79,38,58,60,98,79,38,58,60,98,数一数黑棋、白棋的数目，比较多少,黑棋：,白棋：,52,52,一样多,红金鱼,48,条,花金鱼,15,条,黑金鱼,10,条,黑金鱼比花金鱼,少一些,。,红金鱼比黑金鱼,多得多,。,（2）枝数少于30枝的花有几束？多于30枝的有几束？,（,1,）根据花的枝数，用“多一些、少一些、多得多、,少得多”各说一句话。,（,3,）,30,10,12,50,