最新人教版五年级数学下册练习二

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,*,因数和倍数,课后练习,人教版五年级数学下册第二单元,1,2,3,4,6,9,12,18,36,20,15,30,5,1,2,3,4,6,10,60,12,数,101=10,102=5,10,的因数有,1,2,5,10,。,171=17,17,的因数有,1,17,。,281=28,282=14,284=7,28,的因数有,1,2,4,7,14,28,。,321=32,322=16,324=8,28,的因数有,1,2,4,8,16,32,。,481=48,482=24,483=16,484=12,486=8,48,的因数有,1,2,34,6,，,8,12,16,24,48,。,41=4,42=8,43=12,44=16,45=20,4,的倍数有,4,8,12,16,20,71=7,72=14,73=21,74=28,75=35,7,的倍数有,7,14,21,28,35,101=10,102=20,103=30,104=40,105=50,10,的倍数有,10,20,30,40,50,61=6,62=12,63=18,64=24,65=30,6,的倍数有,6,12,18,24,30,91=9,92=18,93=27,94=36,95=45,9,的倍数有,9,18,27,36,45,151=15,153=5,15,的因数有,1,3,5,15,。,15,是,1,3,5,15,的倍数。,1,2,4,18,1,42,42,的因数有,1,2,3,6,7,14,21,42,。,42,以内,3,的倍数有,3,6,9,12,15,18,21,24,27,30,33,36,39,42,。,21,42,21,42,答：这个数可能是,21,42,。,14=,7,2, 21=,7,3,14,21=,7,2,7,3=,7,（,2,3,）。,一般地,A,、,B,两数都是,C,的倍数，就一定有,m,、,n,使,A=m,C,，,B,= n,C,，因此,A,B=m,C,n,C,=,（,m,n,）,C,。,所以，,A,B,是,C,的倍数。,28,的因数有,1,2,4,7,14, 28,。,1,2,4,7,14,= 28,。,谢谢啦！再见！,