文档介绍:五年级下册数学一课一练约分_人教新课标(含答案)
《约分》同步练****br/>一、单选题
,比较它们的最简真分数的个数的结果为(  )
A. 分母是15的最简真分数的个数多
B. 分母是20的最简真分数的个数多
C. 它们的最简真分数的个数一样多
(  )。
A.                                         B.                                         C. 
,这个分数的分子和分母有(  )个公因数
A. 0                                           B. 1                                           C. 2                                           D. 3
,(  )不是最简分数。
A.                                         B.                                         C. 
,分子和分母的和是9,这样的最简分数有(  )个
A. 4                                              B. 3                                              C. 5
=(  )日
A.                                          B.                                          C. 
,(  )最简分数
A. 一定是                                   B. 一定不是                                   C. 不一定是
(  )
A. 1                                          B. 2                                          C. 0                                          D. 无数
,这个分数一定是(  )
A. 最简分数                                 B. 不是最简分数                                 C. 不确定
,分母乘2,这个分数的分数值将()
A. 乘4                                         B