通分约分专项练习30大题(有答案)

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通分约分专项练习30题(有答案)

1.把下面的分数化成分母是36,而大小不变的分数.

= = =

= ==

2.约分.

= =

==

3.通分

①和②、和.

4.把下列各组分数通分.

和和和和.5.先通分,再比较大小.

6.把下列每组分数化成分母相同而大小不变的分数.

和和和.

7.把下面的分数约分,约分结果是假分数的化成整数或带分数.

8.把下面每组中的两个分数通分.

9.把下面的分数约分.

11.把下面每组中的两个分数通分.

和.

12.约分.

= = = 13.约成最简分数:

14.把下面的分数化成最简分数.

= =

= =

= = = = ====

16.约分:

= =

= =

17.按要求完成下列各题

(1)将分数化成最简分数.

(2)把假分数化成带分数或整数..

18.化简下列各分数.

= = =

= = =

20.把分数、和通分,并比较大小.

21.约分.

= = =

22.约分:

= = = = =

23.把下面每组分数通分.

(1)和

(2)

(3)

(4)、和.

24.约分:

25.把下面各组分数通分,再比较大小.

①2和②和③和.26.把下面不是最简分数的化成最简分数.

27.把下列每组分数化成分母相同而大小不变的分数.

28.通分.(把下列各组分数化成分母相同的分数)

(1)和(2)和(3)和(4)和.

29.把下面每组分数通分

和和和和.30.和和、和.

通分约分专项练习30题参考答案:

1. ;

2.=;

=

=;

=;

3.①=,=;

②=,

=,4.,

5.(1)==;

==;

所以>;

==;

所以<;

(3)==;

==;

所以<

6.和,

7.;

=3;

8.(1);

=;

(2),

;(3),

;(4),

=3;

10.==;

==;

==;

==

11.(1)和

==;

==;

所以)<;

(2)和

==;

>,

所以)>;

(3)和

==;

所以<

12.=;

==;

==

13.==;

==;

==;

==

14.==,

==,

==,

==.

15.;

=2;

=;

.16.==;

==;

==;

==5 17.(1);

(2)=2;

=3;=5.18.==;

==;

==;

==;

==

19.==1;

=;

==2;

==2;

==1;

=;

20.==;

==;

==;

>>,

所以>>

21.==;

==;

==

22. (1)==;

(2)==;

(3)==;

(4)==;

(5)==

23.(1)和,

==,

==;

(2)和,

==,

==;

(3)和,

==,

=;

==,

==,

==.

24.;

=3;

25.①2===,则2>;

②==,==,

则;

③==,==,

则.26.=;

=;

=;

=

27.和

==;

==;

==;

=;

==

==

28.(1)和,

=,

(2)和,

(3)和,

(4)和,

29.(1)5和7的最小公倍

数是35,

==;

==;

(2)6和9的最小公倍数

是18,

==;

==;

(3)3和12的最小公倍数

是12,

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