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,*,R,一年级下册,第,3,课时 数的顺序,R一年级下册第3课时 数的顺序,一、创设情境，引入百数表,一、创设情境，引入百数表,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,123456789101112131415161718192,2,4,6,8,10,11,13,15,17,19,你发现了什么？,二、自主探究，感受数的顺序规律,2468101113151719你发现了什么？二、自主探究，,2,4,6,8,10,11,13,15,17,19,第一横行的,5,个数都是,双数,，而第二横行的,5,个数都是,单数,。,它们都是按照从小到大的顺序排列的。,2468101113151719第一横行的5个数都是双数，而,11,22,33,44,55,66,88,99,?,77,你,发现了什么,规律,？,这一斜行中每个数的,个位与十位上的数字,都,相同,。,1122334455668899?77你发现了什么规律？这一,19,28,37,46,55,64,73,82,91,你,发现了什么,规律,？,这一斜行上的数，十位上的数从1开始，逐渐多1直到9，而个位上的数则相反。,个位和十位上的数字相加是,10,。,192837465564738291你发现了什么规律？这一斜,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,3,13,23,43,53,63,73,83,93,30,32,34,35,36,37,38,39,33,31,33,给十位是3的数涂上绿色；个位是3的数涂上黄色,。,123456789101112131415161718192,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,横着看，先看第二行，你发现了什么？其他各行也有这样的规律吗？,从第二行开始，前,9,个数的十位上都是相同的数。,123456789101112131415161718192,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,竖着看，先看第三列，你又有什么发现？其他各列也是这样的规律吗？,每一列的个位上的数都是相同的。,123456789101112131415161718192,?,5,?,14,?,16,?,25,?,38,?,48,?,54,?,63,?,65,?,67,?,74,?,76,?,78,?,87,说一说,?5?14?16?25?38?48?54?63?65?67?,想一想：,16,的上面、下面、左边、右边各是多少？,6,17,26,15,35,55,44,46,69,89,78,80,你有什么发现？,那,45,呢？,79,呢？,45,79,16,想一想：16的上面、下面、左边、右边各是多少？6172615,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,一个数的上面的那个数比它,_,，下面的那个数比它,_,，左边的那个数比它,_,，右边的那个数比它,_,。,小,10,大,10,小,1,大,1,6,17,26,15,35,55,44,46,69,89,78,80,123456789101112131415161718192,69,77,78,87,45,28,按照百数表中的排列，在下面的空格中填上适当的数。,38,39,44,46,35,55,68,67,29,69 777887 45 28按照百数表中的排列,1.,按顺序连点成画。,三、实践应用，深化感知,1.按顺序连点成画。三、实践应用，深化感知,2.,77,是更接近,70,还是更接近,80,？,72,呢？,70,71,72,76,79,73,74,75,77,78,80,77,更接近,80,72,更接近,70,2.77是更接近70还是更接近80？72呢？7071727,数的顺序,每一行后一个数都比前一个数多,1,每一列下一个数都比上一个数多,10,四、全课小结，促进内化,数的顺序 每一行后一个数都比前一个数多1,一、填 一 填,tin yi tin,1.8,个十和,9,个一合起来是（），和它相邻的两个数是（）和（）。,89,88,90,一、填 一 填tin yi tin1.8个十和9个一合,2.,（,2019,福建漳州,）在,65,、,69,、,72,这三个数中，最接近,70,的数是（）。,3.86,与,92,之间有（）个数。,69,5,2.（2019福建漳州）在65、69、72这三个数中，最,二、找 规 律，填 一 填。,tin yi tin,zho gu l,60,61,62,64,65,66,67,68,82,80,79,78,75,74,73,二、找 规 律，填 一 填。tin yi tinzho,