3 和 4（ ） 17 和 27（ ） 35 和 36（ ） 25 和 70（ ）
一、把下面各数约分。
20 =
40
12 =
18
8=
21 =
12
14
先约分，在化成带分数。 25 =
10
64 =
26
6=
18
21 =
42
26 =
12
44 =
33
27 =
36
15 =
20
21 =
18ቤተ መጻሕፍቲ ባይዱ
五、把 12 和 18 的因数和公因数分别填在下面的圈中，并找出它们的最大公因数。
12 的因数
18 的因数
12 的因数 18 的因数
12 和 18 的最大公因数是（
12 和 18 的公因数 ）。
“
”
“
”
At the end, Xiao Bian gives you a passage. Minand once said, "people who learn to learn are very happy people.". In every wonderful life, learning is an eternal theme. As a professional clerical and teaching position, I understand the importance of continuous learning, "life is diligent, nothing can be gained", only continuous learning can achieve better self. Only by constantly learning and mastering the latest relevant knowledge, can employees from all walks of life keep up with the pace of enterprise development and innovate to meet the needs of the market. This document is also edited by my studio professionals, there may be errors in the document, if there are errors, please correct, thank you!
18
20 20
25
=
=
=
=
=
=
=
=
48
56
72
48
90
36 75
80
30
28
30
15
25
32
=
=
=
=
=
=
75
91
48
75
75
48
先约分，在化成带分数。
64
51
75
=
=
=
36
34
35
70
145
=
=
42
45
69
80
150
90
96
=
=
=
=
=
46
48
45
54
56
72 =
48
25 10 =
164 =
80
26 12 =
378 =
81
57 36 =
144 =
120
21 18 =
180 =
144
64 26 =
下列分数是最简分数的打钩。
4
12
21
39
9
16
5
18
35
51
16
36
六、下面各组数中，是互质数的打“√”。
12
12
35
24
5 和 7（ ） 3 和 23（ ） 1 和 49（ ） 42 和 56（ ）
17 和 51（ ） 34 和 51（ ） 48 和 76（ ） 28 和 70（ ）
约分练习题
姓名:
12 12 ÷ 2 6 ÷ 3 2 64 64 ÷ 16 4 64
28
57
=
＝
==
＝=
=
=
18 18 ÷ 2 9 ÷ 3 3 80 80 ÷ 16 5 80
70
95
26
51
=
=
91
68
16
54
75
=
=
=
40
81
95
12
16
32
30
72
=
=
=
=
=
36
80
48
36
96
20
25
=
=
56
60
39
18
57
=
=
=
78
45
76
24 照样子完成 =
30
24
75 24 28
32
=
=
=
=
=
30
90 64 48
36
36 40 42 45
=
=
=
=
80 72 70 80
46 48 50 36
=
=
=
=
82 84 75 96
51
52
10
12
14
16
18
=
=
=
=
=
=
=
85
90
36
60
49
64
81
12
12
12
16