小学数学人教2011课标版二年级表内除法（二）整理复习.ppt

人教版二年级下册表内除法（二）,整理和复习,执教者：李洁乌鲁木齐市第85小学,一、游戏引入，复习旧知，引入新知。,1、看谁算的快。,22,82,21,63,42,84,62,=4,=2,=2,=2,=2,=3,=1,一、游戏引入，复习旧知，引入新知。,2、整理算式。,22,82,21,63,42,84,62,活动要求：将下面的算式进行分类，并给组里的同学说一说你是怎么分的。,一、游戏引入，复习旧知，引入新知。,分类结果：,（1）按得数分（2）按除数分（3）按乘法口诀分,二、提问启发，探究新知。,1、按要求写算式。,（1）请写出商是1的表内除法算式。,112233445566778899,（2）请写出除数是1的表内除法算式。,112131415161718191,二、提问启发，探究新知。,2、整理除法表。,42,62,82,102,122,142,162,182,93,84,105,155,205,255,305,123,153,183,213,243,273,63,124,164,204,244,284,324,364,=1,=2,=3,=4,=5,=6,=7,=8,=9,=1,=2,=3,=4,=5,=6,=7,=8,=9,355,405,455,二、提问启发，探究新知。,2、整理除法表。,42,62,82,102,122,142,162,182,93,84,105,155,205,255,305,123,153,183,213,243,273,63,124,164,204,244,284,324,364,=1,=1,=1,=1,=1,=1,=1,=1,=1,355,405,455,126,147,168,189,=2,=2,=2,=2,=2,=2,=2,=2,=2,186,217,248,279,二、提问启发，探究新知。,2、整理除法表。,42,62,82,102,122,142,162,182,93,84,105,155,205,255,305,123,153,183,213,243,273,63,124,164,204,244,284,324,364,=1,=1,=1,=1,=1,=1,=1,=1,=1,355,405,455,126,147,168,189,=2,=2,=2,=2,=2,=2,=2,=2,=2,186,217,248,279,246,=2,=3,=4,=5,=6,=7,=8,=9,306,366,426,486,546,287,357,427,497,567,637,328,408,488,568,648,728,369,459,549,639,729,819,问题：（1）在整理的这个表格中快速找出得数为7的算式。,（2）得数是8的算式有哪些？得数是9的呢？,（3）你是怎么找的？,1.根据得数找算式。,三、游戏活动，巩固记忆。,小结：原来得数是几，我们就得找跟几的口诀有关系的除法算式。,三、游戏活动，巩固记忆。,2、让我猜一猜。,123,153,183,213,243,273,124,164,204,244,284,324,364,105,155,205,255,305,355,405,455,66,126,186,246,306,366,426,486,546,77,88,99,147,217,287,357,427,497,567,637,168,248,328,408,488,568,648,728,189,279,369,459,549,639,729,819,8,56,5,7,5,21,6,60,7,648,459,306,37,546,568,729,284,59,427,27