2和5的倍数的特征公开课课件[1]

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,*,5和2的倍数的特征,苏教版四年级下册第九单元,复习回顾,7,的倍数：,32,的因数：,7,14,21,28,35,1,2,4,8,16,32,。,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,在,5,的倍数上画，在,2,的倍数上画,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,在,5,的倍数上画，在,2,的倍数上画,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,在,5,的倍数上画，在,2,的倍数上画,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,在,5,的倍数上画，在,2,的倍数上画,个位上的数是,2,4,6,8,或,0,5,的倍数,2,的倍数,个位上的数是,5,或,0,特征,什么是,偶数,？,什么是,奇数,？,是,2,的倍数的数,不是,2,的倍数的数,双数,单数,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,在,5,的倍数上画，在,2,的倍数上画,巩固练习,1,、下面的数，哪些是,2,的倍数？哪些是,5,的倍数？哪些既是,2,的倍数，又是,5,的倍数？,12 25 48 60 72 90,巩固练习,2,、填一填,58 74 89 120 231 155 600,偶数,奇数,巩固练习,3,、选出两张数字卡片，按要求组成一个数。,0,5,6,7,（,1,）组成的数是偶数。,（,2,）组成的数是,5,的倍数。,（,3,）组成的数既是,2,的倍数，又是,5,的倍数。,巩固练习,4,、用,0,、,2,、,5,三个数字组成一个三位数。,（,1,）组成的数是,2,的倍数。,（,2,）组成的数是,5,的倍数。,巩固练习,5,、把下表中,4,的倍数涂上颜色。,今天这节课你有什么新的收获？,拓展练习,1,、五位数,ASBK5,是,5,的倍数吗？为什么？,2,、四位数,397C,，如果是,2,的倍数，,C,是（ ）；,如果既是,5,的倍数，也是,2,的倍数，,则,C,是（ ）。,