小学数学人教一年级数的顺序-大小比较.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,数的顺序,比较大小,第四单元,100,以内数的认识,复习旧知,1,、数数：从,50,数到,100,数出个位和十位数字相同的两位数,数出末尾是,0,的数,2,、比较,20,以内数的大小：教师出示题目，指名比较两个数的大小，并说明原因。“你是怎样想的？”,15 17 19 11 20 12,想：先从十位看起，十位上的数大，这个两位数就大。如果十位上的数相同，就看个位上的数，个位上的数大的，则这个两位数就大。,100,98,97,96,95,94,93,92,90,89,87,86,85,8483,81,80,79,78,76,75,74,72,71,70,69,68,67,65,63,62,61,60,59,58,57,56,54,53,52,51,50,49,48,47,45,43,42,41,40,39,38,36,35,34,32,31,30,29,27,26,25,24,23,21,20,18,16,14,12,9,7,5,3,1,13,2,11,22,33,44,55,66,77,88,99,4,6,8,10,15,17,19,28,37,46,64,73,82,91,按照数的顺序在空格里填数,:,百数表中藏着好多秘密呢，小朋友你发现了吗？,1,2,3,4,5,6,78,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,给十位是,3,的数涂上绿色。,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,给个位是,3,的数涂上黄色。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,给个位和十位数字相同的数涂上粉色。,2,4,6,8,10,11,13,15,17,19,22,28,33,37,44,46,55,64,66,73,77,82,88,91,99,你还能从表里发现哪些有趣的排列？,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,第,4,行第,8,个数是多少,?,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,55,前面一个数是多少？,25,42,26,35,24,15,70,79,88,97,53,64,54,52,62,63,44,43,80,90,89,98,99,100,魔力框,说出,1,100,中个位上是,5,的所有的数。,说出,1,100,中十位上是,5,的所有的数。,猜一猜,在,1,100,中，个位上是,0,的数一共有多少个？在第几列的位置上？,个位上是,1,的数在第几列？,十位上是,9,的数有多少个？在第几行的位置上？,填一填,比,69,大,1,的数是,(),，比,69,少,10,的数是（），比,69,多,30,的数在第（）列的位置上。,比,100,小,1,的数是,(),。,40,比,(),大,1,，比,(),小,1,。,70,99,39,41,59,9,比一比,42,37,42,里面有,4,个十。,37,里面有,3,个十。,比一比,两位数比大小，先比十位，,十位上的数一样，再比个位，,个位上的数大的这个数就大,。,百位十位个位,百位十位个位,23,25,2 3,2 5,比一比,29,30,两位数比大小，先比十位，,十位上的数大这个数就大。,百位,十位,个位,2,9,百位,十位,个位,3,0,百位十位个位,百位十位个位,比一比,81,18,两位数比大小，先比十位，,十位上的数大这个数就大。,8 1,1 8,64,58,45,47,6,5,4,4,5,7,两位数比大小，先比十位，,十位上的数一样，再比个位，,个位上的数大的这个数就大,。,在 里填上“,”,或“,=”,。,41 45,68 78,57 56,98 89,80 90,69 69,=,79,65,60,38,98,（）（）（）（）（）,38,60,65,79,98,今天你有什么收获？,