北师大版五年级数学上册《找最小公倍数6》PPT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,*,找最小公倍数,第十一小学,白东霞,北师大版五年级数学上册课件,请你在下表中用“,”标出,4,的倍数，用,表示,6,的倍数,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,4,的倍数有：,4,、,8,、,12,、,16,、,20,、,24,、,28,、,32,、,36,、,40,、,44,、,48,6,的倍数有：,6,、,12,、,18,、,24,、,30,、,36,、,42,、,48,4,的倍数有：,4,、,8,、,12,、,16,、,20,、,24,、,28,、,32,、,36,、,40,、,44,、,48,6,的倍数有：,6,、,12,、,18,、,24,、,30,、,36,、,42,、,48,定义：,几个数公有的倍数叫做这几个数的公倍数；,其中最小的一个叫这几个数的最小公倍数。,4,和,6,的公倍数有：,12,、,24,、,36,、,48,4,和,6,的最小公倍数是：,12,12,12,24,24,36,36,48,48,小结：,求几个数的最小公倍数的基本方法：,1,、先分别找出几个数的倍数。,2,、再找出几个数的公倍数。,3,、其中最小的一个就是它们的最小公倍数。,练习：,1.,填一填：,50,以内,6,的倍数：,50,以内,9,的倍数：,6,12,18,24,30,36,42,48,9,18,27,36,45,50,以内,6,和,9,的公倍数有哪些？,36,36,18,18,50,以内,6,和,9,的公倍数有：,18,、,36,18,36,6,12,24,30,42,48,9,27,45,50,以内,6,和,9,的最小公倍数是：,18,50,以内,6,和,9,的公倍数,所以：,18,36,18,36,2,、填空,1,2,3,4,5,6,7,8,9,8,8,16,6,6,12,24,32,40,48,56,64,72,18,24,30,36,42,48,54,50,以内,6,和,8,的公倍数有：,24,、,48,最小公倍数是：,24,24,48,24,48,24,24,3,、直接写出下列各组数的最小公倍数。,3,和,6,2,和,7,4,和,5,4,和,9,5,和,10,8,和,9,1,、如果较大数是较小数的倍数，那么,它们的最小公倍数 是较大数。,2,、如果两个数互质，那么它们的最小,公倍数是它们的乘积。,通过本课学习，你学会了什么？,