2和5的倍数的特征知识分享.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,*,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,*,2,和,5,的倍数的特征,复习,怎样找一个数的倍数？,从小到大写出,2,的倍数（,10,个）：,写出,5,的倍数（,6,个）,2,，,4,，,6,，,8,，,10,，,12,，,14,，,16,，,18,，,20,5,，,10,，,15,，,20,，,25,，,30,43467897654332,87654445667,8876654450,2,的倍数的特征,座位号是多少的同学,应该从双号入口进,?,座位号为,2,，,4,，,6,，,8,，,10,，,2=1,2,4=2,2,6=3,2,8=4,2,10=5,2,这些数都是,2,的倍数。,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,2,的倍数,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,个位上是：,自然数中，是,2,的倍数的数叫做,偶数,(,0,也是偶数,),，不是,2,的倍数的数叫做,奇（,j,),数,。,0,，,2,，,4,，,6,，,8,你发现,2,的倍数有什么特征吗,?,的数都是,2,的倍数。,下列数中，哪些是奇数，哪些是偶数,?,33,98,355,988,0,123,3678,8089,1000,655,5656,881,奇数,偶数,最小的偶数是几？有没有最大的偶数？,最小的奇数是几？有没有最大的奇数？,最小的偶数是,0,，没有最大的偶数。,最小的奇数是,1,，没有最大的奇数。,考 考 你,5,的倍数的特征,5,的倍数 又有什么特征呢？,在下表中找出,5,的倍数，并涂上颜色。看看有什么规律。,课本,18,页,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,_,或,_,的数，是,5,的倍数。,0,5,2,的倍数,5,的倍数,既是,2,的倍数,又是,5,的倍数,24,90,60,106,130,280,35,90,15,60,75,130,280,90,60,130,280,下面哪些数是,2,的倍数,?,哪些数是,5,的倍数,?,哪些数既是,2,的倍数也是,5,的倍数,?,24,35,67,90,99,15,60,75,106,521,130,280,P18,做完这道题，你有什么收获,?,个位上是,0,的数，既是,2,的倍数，又是,5,的倍数。,1,、一个自然数不是奇数就是偶数（）,3,、同时是,2,、,5,的倍数的个位上的数,字一定是,0,（）,我是小法官,2,、,10,是倍数，,5,是因数（）,19,36,104,48,65,287,78,153,找出,2,的倍数。,104,36,48,78,个位是（）的数同时是,2,和,5,的倍数。,用,0,、,5,、,6,三个数字组成,2,的倍数；,5,的倍数；同时是,2,和,5,的倍数。,0,2,的倍数,5,的倍数,560,650,605,506,560,650,既是,2,的倍数也是,5,的倍数,我会填,摸出几可以和“,5”,组成,2,的倍数,?,摸出几可以和“,5”,组成,5,的倍数,口袋里有,09,的数字卡片,数学游戏,摸出,0,、,2,、,4,、,6,、,8,可以和“,5”,组成,2,的倍数。,摸出,1,、,2,、,3,、,4,、,5,、,6,、,7,、,8,、,9,、,0,可以和“,5”,组成,5,的倍数。,全课小结,2,的倍数的特征：个位上是,0,、,2,、,4,、,6,、,8,的数，都是,2,的倍数。（也就是能被,2,整除的数）,5,的倍数的特征：个位上是,0,或,5,的数，都是,5,的倍数。（也就是能被,5,整除的数）,2,和,5,的共同倍数的特征：个位上是,0,的数，是,2,和,5,的倍数。（也就是同时能被,2,和,5,整除的数）,严谨认真,天天进步,休息,休息一会,