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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,*,123,2,、,5,的倍数的特征,山东省昌乐县西湖小学,王 传 荣,青岛版小学数学五年级上册,在,12,8=96,中，,是,的因数，,是,的倍数。,在,408=5,中，,是,的因数，,是,的倍数。,95,是,5,的倍数码，它是,2,的倍数码？为什么,5,和,8,40,40,5,和,8,12,和,8,96,96,12,和,8,复习：,交谊舞和圆圈舞分别可以派多少人参加？,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,百位数表,2,的倍是数的数（,看看你们涂的和老师涂的一样吗？,）,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,个位上是,0,、,2,、,4,、,6,、,8,2,的倍数特征：,5,的倍数的数（,看看你们涂的和老师涂的一样吗？,）,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,个位上是,0,或,5,5,的倍数特征：,18 21 30 35 39 40 15 26 1 72 85 310 487 894,比一比谁的判断能力强,2,的倍数,5,的倍数,30 40 26,72 310 894,35 40 15,85 310,既是,2,的倍数，,又是,5,的倍数？,30 40 310,自然数中是,2,的倍,数的数叫做偶数，不,是,2,的倍数的数叫做奇,数。,看一看，想一想,:,偶数有什么特征,?,奇数有什么特征,?,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,下列数中，哪些是奇数，哪些是偶数,?,33,98,355,988,123,3678,8089,1000,655,5656,881,奇数,偶数,火眼金睛辩对错,（,1,）偶数都是,2,的倍数。 （ ）,（,2,）,2,的倍数都是偶数，,5,的倍数都是奇数。（ ）,（,3,）个位上是,0,的数，既是,2,的倍数又是,5,的倍数。（ ）,（,6,）,5,的倍数比,2,的倍数大。 （ ）,（,7,）一个自然数，不是偶数就是奇数。 （ ）,想一想，组一组,任选两个数字组成符合下面要求的数：,6 0 9 5,奇数：,_,2,的倍数：,_,既是,2,的倍数，又是,5,的倍数：,_,阳光体育节就要到了。我校五年级各班都要表演双人舞、五人舞中的一项，要求全员参加，根据各班的人数，你认为各班表演哪种舞比较合适？,班级,五一,五二,五三,五四,人数,54,52,55,50,2,、,5,的倍数的特征,个位上,是,0,、,2,、,4,、,6,、,8,的数 ，,都是,2,的倍数,2,的倍数的特征：,是,2,的倍数,不是,2,的倍数,5,的倍数的特征,：,个位上,是,0,、,5,的数，都是,5,的倍数,既是,2,的倍数,又是,5,的倍数的数：,个位上一定是（ ）,0,回顾,0,0,偶数,奇数,
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