北师大版小学一年级数学下册《做个百数表》生活中的数教学课件.ppt
生活中的数,做个百数表,生活中的数做个百数表,【重点】理解百数表上行和列的编排规律。,【难点】能运用百数表上行和列的编排规律,正确地填表。,1.在百数表上认识100以内的数。2.在百数表上进行数的定位练习,探究数与数之间的关系。3.培养和提升学生的思维能力、学习能力,让学生获得积极的情感体验。,【重点】理解百数表上行和列的编排规律。【难点】能运用百数表上,11,2,3,4,5,6,7,8,9,13,14,15,16,17,18,20,21,22,24,25,26,27,29,30,31,32,35,36,39,40,33,38,41,42,44,47,49,50,43,48,51,52,54,57,59,60,53,58,61,62,65,66,69,70,63,68,71,72,74,75,76,77,79,80,81,84,85,86,87,90,83,88,92,94,95,96,97,99,93,98,你能从1数到100吗?在右面表格中填一填吧。,112345678913141516171820212224,同学们,说一说,你发现了什么?,同学们,说一说,你发现了什么?,从 左 往 右 横 着 看,你 发 现 了 什 么?,1.每行的数都按每次大1的顺序排列。2.从第二横行起,每一行前9格的十位是相同的,个位上的数相差1,最后一格,变成比这行十位上的数大1的整十数。,从 左 往 右 横 着 看,你 发 现 了 什 么?1.每行,从上往下竖着看,你 发 现 了 什 么?,1.每列个位上的数是相同的。2.每列上下两个数之间相差10。,从上往下竖着看,你 发 现 了 什 么?1.每列个位上的数是,对角斜着看,你 发 现 了 什 么?,1.从左下角到右上角的斜行,相邻两个数之间相差9。2.从左上角到右下角的斜行,相邻两个数之间相差11。,对角斜着看,你 发 现 了 什 么?1.从左下角到右上角的斜,(1)把个位上的数是“0”的涂上绿色。,11,2,3,4,5,6,7,8,9,13,14,15,16,17,18,20,21,22,24,25,26,27,29,30,31,32,35,36,39,40,33,38,41,42,44,47,49,50,43,48,51,52,54,57,59,60,53,58,61,62,65,66,69,70,63,68,71,72,74,75,76,77,79,80,81,84,85,86,87,90,83,88,92,94,95,96,97,99,93,98,1,(1)把个位上的数是“0”的涂上绿色。11234567891,(2)把个位上的数是“7”的涂上蓝色。,11,2,3,4,5,6,7,8,9,13,14,15,16,17,18,20,21,22,24,25,26,27,29,30,31,32,35,36,39,40,33,38,41,42,44,47,49,50,43,48,51,52,54,57,59,60,53,58,61,62,65,66,69,70,63,68,71,72,74,75,76,77,79,80,81,84,85,86,87,90,83,88,92,94,95,96,97,99,93,98,(2)把个位上的数是“7”的涂上蓝色。11234567891,(3)把个位和十位上的数相同的涂上黄色。,11,2,3,4,5,6,7,8,9,13,14,15,16,17,18,20,21,22,24,25,26,27,29,30,31,32,35,36,39,40,33,38,41,42,44,47,49,50,43,48,51,52,54,57,59,60,53,58,61,62,65,66,69,70,63,68,71,72,74,75,76,77,79,80,81,84,85,86,87,90,83,88,92,94,95,96,97,99,93,98,(3)把个位和十位上的数相同的涂上黄色。1123456789,(4)把个位上的数比十位上的数少1的涂上红色。,11,2,3,4,5,6,7,8,9,13,14,15,16,17,18,20,21,22,24,25,26,27,29,30,31,32,35,36,39,40,33,38,41,42,44,47,49,50,43,48,51,52,54,57,59,60,53,58,61,62,65,66,69,70,63,68,71,72,74,75,76,77,79,80,81,84,85,86,87,90,83,88,92,94,95,96,97,99,93,98,(4)把个位上的数比十位上的数少1的涂上红色。1123456,2,小熊写门牌号。,30,31,80,79,2小熊写门牌号。30318079,3,看一看,填一填。,36,38,40,60,50,90,100,3看一看,填一填。363840605090100,4,想一想,填一填。,29,大1,大10,37,39,47,48,30,32,41,50,52,75,74,76,84,86,94,95,96,4想一想,填一填。29大1大1037394748303241,5,想一想,填一填。,66,76,77,78,68,58,57,56,79,69,70,68,59,33,32,22,5想一想,填一填。667677786858575679697,百数表上行和列的编排规律:1.从 左 往 右 横 着 看每行的数都按每次大1的顺序排列。从第二横行起,每一行前9格的十位是相同的,个位上的数相差1,最后一格,变成比这行十位上的数大1的整十数。2.从上往下竖着看每列个位上的数是相同的。每列上下两个数之间相差10。3.从左上角到右下角斜着看从左下角到右上角的斜行,相邻两个数之间相差9。从左上角到右下角的斜行,相邻两个数之间相差11。,百数表上行和列的编排规律:,1,找规律,填一填。,(1)19 29 ( )( )59( )(2)33 ( ) 55 66 ( )( )(3)23 34 45( )( )( )(4)( )86( ) 88 89 ( ),39,49,69,44,77,88,56,67,78,85,87,90,1找规律,填一填。(1)19 29 ( )(,把个位上的数是“3”的涂上绿色。,11,2,3,4,5,6,7,8,9,13,14,15,16,17,18,20,21,22,24,25,26,27,29,30,31,32,35,36,39,40,33,38,41,42,44,47,49,50,43,48,51,52,54,57,59,60,53,58,61,62,65,66,69,70,63,68,71,72,74,75,76,77,79,80,81,84,85,86,87,90,83,88,92,94,95,96,97,99,93,98,2,把个位上的数是“3”的涂上绿色。11234567891314,把个位上的数是“6”的涂上蓝色。,11,2,3,4,5,6,7,8,9,13,14,15,16,17,18,20,21,22,24,25,26,27,29,30,31,32,35,36,39,40,33,38,41,42,44,47,49,50,43,48,51,52,54,57,59,60,53,58,61,62,65,66,69,70,63,68,71,72,74,75,76,77,79,80,81,84,85,86,87,90,83,88,92,94,95,96,97,99,93,98,2,把个位上的数是“6”的涂上蓝色。11234567891314,把个位上的数比十位上的数少2的涂上红色。,11,2,3,4,5,6,7,8,9,13,14,15,16,17,18,20,21,22,24,25,26,27,29,30,31,32,35,36,39,40,33,38,41,42,44,47,49,50,43,48,51,52,54,57,59,60,53,58,61,62,65,66,69,70,63,68,71,72,74,75,76,77,79,80,81,84,85,86,87,90,83,88,92,94,95,96,97,99,93,98,2,把个位上的数比十位上的数少2的涂上红色。1123456789,3,填一填。,34,23,25,43,45,65,54,56,74,76,78,67,69,87,89,3填一填。 342325434565545674767867,