五年级数学下册第4单元《分数的意义和性质》通分一课一练新人教版

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1、《通分》同步练习一、单选题1.两个分数通分后的新分母是原来两个分母的乘积，原来的两个分母一定（ ）A. 都是质数                               B. 是相邻的自然数                               C. 是互质数2.下面各数中，最小的是（ ）A.                                           B.                                           C. 3.通分的依据是（ ）A.

2、 分数的基本性质                         B. 分数的意义                         C. 分数与除法的关系4.把两个异分母分数化成两个同分母分数，分数的大小（ ）A. 不变                                         B. 变大                                         C. 变小5.异分母分数通分后的分数单位与原来的分数单位比（ ）A. 相等                      

3、              B. 变小                                    C. 变大                                    D. 不确定6.与 相等的分数有（）个A. 5                                     B. 10                                     C. 无数个                                     D. 不确定7. 和 之间的分

4、数有（ ）个A. 2                                         B. 无数个                                         C. 1                                         D. 38.在 、 、 、 中，最大的是（ ）A.                                      B.                                      C.        

5、                              D. 9.通分的作用在于使（）A. 分母统一，规格相同，不容易写错B. 分母统一，分数单位相同，便于比较和计算C. 分子和分母有公约数，便于约分10.通分可以把分数单位（ ）A. 变大                                    B. 变小                                    C. 不变                                    D. 不确定11.通分时分数的分

6、子和分母都扩大了，分数值（）A. 也随之扩大                                B. 变小                                C. 不变                                D. 不确定12.一个最简真分数，分子与分母的和是10，这样的分数有（）A. 2                                           B. 3                                         

7、  C. 4                                           D. 513. ＜ ＜ ，□里可以填哪个自然数，选（   ）A. 2                                             B. 5                                             C. 1014.把 和 通分后分母是（）A. 4                                             B. 20     

8、                                        C. 3015.把 和 通分后的分母是（）A. 7                                             B. 11                                             C. 77二、填空题16.如果a、b只有公因数1， 、 通分后是________、_______