## Subtract a Fraction from Unlike Fraction

Name
Date

1
3/6
-
3/8
=
2
8/7
-
3/9
=
3
4/3
-
8/7
=
4
3/5
-
1/2
=
5
10/8
-
4/9
=
6
10/5
-
4/6
=
7
6/8
-
5/9
=
8
8/3
-
7/10
=
9
10/8
-
9/10
=
10
5/4
-
3/8
=

1
3/6
-
3/8
=
1/8
find the LCM for unlike denominators
LCM (6, 8) = 24
36
=
3 x 246 x 24
=
3 x 424
=
1224
38
=
3 x 248 x 24
=
3 x 324
=
924
36
-
38
=
1224
-
924
=
12  -  924
36
-
38
=
324
simplify the above fraction
GCF(3, 24) = 3
324
=
3 ÷ 324 ÷ 3
=
18
36
-
38
=
18
2
8/7
-
3/9
=
17/21
find the LCM for unlike denominators
LCM (7, 9) = 63
87
=
8 x 637 x 63
=
8 x 963
=
7263
39
=
3 x 639 x 63
=
3 x 763
=
2163
87
-
39
=
7263
-
2163
=
72  -  2163
87
-
39
=
5163
simplify the above fraction
GCF(51, 63) = 3
5163
=
51 ÷ 363 ÷ 3
=
1721
87
-
39
=
1721
3
4/3
-
8/7
=
4/21
find the LCM for unlike denominators
LCM (3, 7) = 21
43
=
4 x 213 x 21
=
4 x 721
=
2821
87
=
8 x 217 x 21
=
8 x 321
=
2421
43
-
87
=
2821
-
2421
=
28  -  2421
43
-
87
=
421
4
3/5
-
1/2
=
1/10
find the LCM for unlike denominators
LCM (5, 2) = 10
35
=
3 x 105 x 10
=
3 x 210
=
610
12
=
1 x 102 x 10
=
1 x 510
=
510
35
-
12
=
610
-
510
=
6  -  510
35
-
12
=
110
5
10/8
-
4/9
=
29/36
find the LCM for unlike denominators
LCM (8, 9) = 72
108
=
10 x 728 x 72
=
10 x 972
=
9072
49
=
4 x 729 x 72
=
4 x 872
=
3272
108
-
49
=
9072
-
3272
=
90  -  3272
108
-
49
=
5872
simplify the above fraction
GCF(58, 72) = 2
5872
=
58 ÷ 272 ÷ 2
=
2936
108
-
49
=
2936
6
10/5
-
4/6
=
4/3
find the LCM for unlike denominators
LCM (5, 6) = 30
105
=
10 x 305 x 30
=
10 x 630
=
6030
46
=
4 x 306 x 30
=
4 x 530
=
2030
105
-
46
=
6030
-
2030
=
60  -  2030
105
-
46
=
4030
simplify the above fraction
GCF(40, 30) = 10
4030
=
40 ÷ 1030 ÷ 10
=
43
105
-
46
=
43
7
6/8
-
5/9
=
7/36
find the LCM for unlike denominators
LCM (8, 9) = 72
68
=
6 x 728 x 72
=
6 x 972
=
5472
59
=
5 x 729 x 72
=
5 x 872
=
4072
68
-
59
=
5472
-
4072
=
54  -  4072
68
-
59
=
1472
simplify the above fraction
GCF(14, 72) = 2
1472
=
14 ÷ 272 ÷ 2
=
736
68
-
59
=
736
8
8/3
-
7/10
=
59/30
find the LCM for unlike denominators
LCM (3, 10) = 30
83
=
8 x 303 x 30
=
8 x 1030
=
8030
710
=
7 x 3010 x 30
=
7 x 330
=
2130
83
-
710
=
8030
-
2130
=
80  -  2130
83
-
710
=
5930
9
10/8
-
9/10
=
7/20
find the LCM for unlike denominators
LCM (8, 10) = 40
108
=
10 x 408 x 40
=
10 x 540
=
5040
910
=
9 x 4010 x 40
=
9 x 440
=
3640
108
-
910
=
5040
-
3640
=
50  -  3640
108
-
910
=
1440
simplify the above fraction
GCF(14, 40) = 2
1440
=
14 ÷ 240 ÷ 2
=
720
108
-
910
=
720
10
5/4
-
3/8
=
7/8
find the LCM for unlike denominators
LCM (4, 8) = 8
54
=
5 x 84 x 8
=
5 x 28
=
108
54
-
38
=
108
-
38
=
10  -  38
54
-
38
=
78