五年级下册《25倍数的特征》课件

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,复习练习,1,、怎样找一个数的倍数？,2,、从小到大写出,2,的倍数（,6,个）：,3,、写出,5,的倍数（,6,个）,2,，,4,，,6,，,8,，,10,，,12,5,，,10,，,15,，,20,，,25,，,30,2,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,这些数与,2,有什么关系？,找,2,的倍数的特征,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,是不是所有,2,的倍数的个位上都是,0,、,2,、,4,、,6,、,8,呢？你能举个例子吗？,请你观察这些数，它们的个位都有什么特点？,的倍数有：,2,，,4,，,6,，,8,，,10,，,12,，,14,，,16,，,18,2,0,4,6,8,5,的倍数的特征,5,的倍数 又有什么特征呢？,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,在下表中找出,5,的倍数，并涂上颜色。看看有什么规律。,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,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。,巩固练习,下面哪些数是2的倍数，哪些数是5的倍数，哪些数既是2的倍数又是5的倍数？,12 70 23 95 105 2012 6005 300 898 1000,2,的倍数,：,12,70 2012 300 898 1000,5,的倍数：,70 95 105 6005 300 1000,2,和,5,的倍数：,70 300 1000,家庭作业,下面哪些数是2的倍数？哪些数是5的倍数？哪些数既是2的倍数又是5的倍数？哪些是奇数？哪些是偶数？,37 12 11 26 2008 1000 2012 30 54 36 40 33 39 44 38 58 97 79,2的倍数：,5的倍数：,既是2的倍数也是5的倍数：,Bye bye!,