2除法整理与复习上课.ppt

整理与复习,表内除法（二）,王红英,数学王国,186,486,648,549,205,93,549,366,284,123,455,217,328,273,153,255,183,213,243,273,164,204,244,324,364,355,455,405,305,546,426,497,567,637,648,728,819,22,42,62,82,102,122,142,162,182,你能把除法算式有规律的排一下。,要求：1、小组合作完成；2、说一说你们是按照怎样的规律排列；3、你能在表格上把规律标上记号吗？,我们按照（）的规律排列,11,31,41,51,61,71,81,21,91,42,62,82,102,122,142,162,182,93,123,153,183,213,243,273,204,244,284,324,364,164,305,355,405,455,255,366,426,486,546,497,567,637,728,648,819,表内除法算式整理,说说除法算式是按怎样的规律排列的？,11,31,41,51,61,71,81,21,91,42,62,82,102,122,142,162,182,93,123,153,183,213,243,273,204,244,284,324,364,164,305,355,405,455,255,366,426,486,546,497,567,637,728,648,819,竖着看每一列除数相同,表内除法算式整理,=1,=2,=3,=4,=5,=6,=7,=8,=9,当除数是1的时候，被除数和除数相等。,11,31,41,51,61,71,81,21,91,42,62,82,102,122,142,162,182,93,123,153,183,213,243,273,204,244,284,324,364,164,305,355,405,455,255,366,426,486,546,497,567,637,728,648,819,=9,=9,=9,=9,=8,=9,=9,=9,=9,=9,=8,=8,=8,=8,=8,=8,=8,=7,=7,=7,=7,=7,=7,=7,=6,=6,=6,=6,=6,=6,=5,=5,=5,=5,=4,=5,=4,=4,=4,=3,=3,=1,=3,=2,=2,横着看：每一排商相同,表内除法算式整理,11,31,41,51,61,71,81,21,91,42,62,82,102,122,142,162,182,93,123,153,183,213,243,273,204,244,284,324,364,164,305,355,405,455,255,366,426,486,546,497,567,637,728,648,819,表内除法算式整理,斜着看：有什么规律,11,31,41,51,61,71,81,21,91,42,62,82,102,122,142,162,182,93,123,153,183,213,243,273,204,244,284,324,364,164,305,355,405,455,255,366,426,486,546,497,567,637,728,648,819,表内除法算式整理,斜着看：有什么规律,一句乘法口诀对应一个除法算式,=2,=3,=4,=5,=6,=7,=8,=9,=1,除数和商相等,11,31,41,51,61,71,81,21,91,42,62,82,102,122,142,162,182,93,123,153,183,213,243,273,204,244,284,324,364,164,305,355,405,455,255,366,426,486,546,497,567,637,728,648,819,22,33,44,55,66,77,88,99,被除数和除数都相同,表内除法算式整理,11,31,41,51,61,71,81,21,91,42,62,82,102,122,142,162,182,93,123,153,183,213,243,273,204,244,284,324,364,164,305,355,405,455,255,366,426,486,546,497,567,637,728,648,819,22,33,44,55,66,77,88,99,表内除法算式整理,186,549,217,205,328,你能在表格中找到这些算式的位置吗,11,31,41,51,61,71,81,21,91,42,62,82,102,122,142,162,182,93,123,153,183,213,243,273,204,244,284,324,364,164,305,355,405,455,255,366,426,486,546,497,567,637,728,648,819,22,33,44,55,66,77,88,99,表内除法算式整理（一）,186,205,217,328,549,11,31,41,51,61,71,81,21,91,42,62,82,102,122,142,162,182,93,123,153,183,213,243,273,204,244,284,324,364,164,305,355,405,455,255,366,426,486,546,497,567,637,728,648,819,22,33,44,55,66,77,88,99,124,63,84,105,155,205,306,246,126,186,427,357,287,217,147,568,488,408,328,248,168,729,639,459,549,369,279,189,这一组算式可以用同一句乘法口诀求商,表内除法算式整理（一）,11,31,41,51,61,71,81,21,91,42,62,82,102,122,142,162,182,93,123,153,183,213,243,273,204,244,284,324,364,164,305,355,405,455,255,366,426,486,546,497,567,637,728,648,819,22,33,44,55,66,77,88,99,124,63,84,105,155,205,306,246,126,186,427,357,287,217,147,568,488,408,328,248,168,729,639,459,549,369,279,189,表内除法算式整理（一）,11,31,41,51,61,71,81,21,91,42,62,82,102,122,142,162,182,93,123,153,183,213,243,273,204,244,284,324,364,164,305,355,405,455,255,366,426,486,546,497,567,637,728,648,819,表内除法算式整理（二）,=9,=9,=9,=9,=9,=9,=9,=9,=9,=8,=7,=6,=5,=4,=3,=2,=1,每一列算式的商相同,每一排算式的商依次少1,1、口算。,闯过计算关,7292845942764830627354645937328567,2、算出结果，然后按从小到大的顺序排列起来。,闯过计算关,549,186,408,455,639,567,5683,6,3,5,9,7,8,21,动物园里有8只黑鸽子，24只白鸽子。你能提出什么问题吗？,闯过问答关,白鸽子的只数是黑鸽子的几倍？,一共需要多少个窝？,每个窝里住4只,2483,8+2432（只）,324=8（个）,答：白鸽子的只数是黑鸽子的3倍。,答：一共需要8个窝。,闯关搭积木,66=36（人）369=4（组）,669=4（组）,闯过故事关,知识抢答赛开始了！,1、找规律填数。