3/6
-
3/8
=
Subtract a Fraction from Unlike Fraction
Name
Grade
School
Date
Questions10
Score
1
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
=
Answers Key
1
3/6
-
3/8
=
1/8
find the LCM for unlike denominators
LCM (6, 8) = 24
36
38
36
36
simplify the above fraction
GCF(3, 24) = 3
324
36
LCM (6, 8) = 24
36
=
3 x 246 x 24 =
3 x 424 =
122438
=
3 x 248 x 24 =
3 x 324 =
92436
-
38 =
1224 -
924 =
12 - 92436
-
38 =
324simplify the above fraction
GCF(3, 24) = 3
324
=
3 ÷ 324 ÷ 3
=
1836
-
38 =
182
8/7
-
3/9
=
17/21
find the LCM for unlike denominators
LCM (7, 9) = 63
87
39
87
87
simplify the above fraction
GCF(51, 63) = 3
5163
87
LCM (7, 9) = 63
87
=
8 x 637 x 63 =
8 x 963 =
726339
=
3 x 639 x 63 =
3 x 763 =
216387
-
39 =
7263 -
2163 =
72 - 216387
-
39 =
5163simplify the above fraction
GCF(51, 63) = 3
5163
=
51 ÷ 363 ÷ 3
=
172187
-
39 =
17213
4/3
-
8/7
=
4/21
find the LCM for unlike denominators
LCM (3, 7) = 21
43
87
43
43
LCM (3, 7) = 21
43
=
4 x 213 x 21 =
4 x 721 =
282187
=
8 x 217 x 21 =
8 x 321 =
242143
-
87 =
2821 -
2421 =
28 - 242143
-
87 =
4214
3/5
-
1/2
=
1/10
find the LCM for unlike denominators
LCM (5, 2) = 10
35
12
35
35
LCM (5, 2) = 10
35
=
3 x 105 x 10 =
3 x 210 =
61012
=
1 x 102 x 10 =
1 x 510 =
51035
-
12 =
610 -
510 =
6 - 51035
-
12 =
1105
10/8
-
4/9
=
29/36
find the LCM for unlike denominators
LCM (8, 9) = 72
108
49
108
108
simplify the above fraction
GCF(58, 72) = 2
5872
108
LCM (8, 9) = 72
108
=
10 x 728 x 72 =
10 x 972 =
907249
=
4 x 729 x 72 =
4 x 872 =
3272108
-
49 =
9072 -
3272 =
90 - 3272108
-
49 =
5872simplify the above fraction
GCF(58, 72) = 2
5872
=
58 ÷ 272 ÷ 2
=
2936108
-
49 =
29366
10/5
-
4/6
=
4/3
find the LCM for unlike denominators
LCM (5, 6) = 30
105
46
105
105
simplify the above fraction
GCF(40, 30) = 10
4030
105
LCM (5, 6) = 30
105
=
10 x 305 x 30 =
10 x 630 =
603046
=
4 x 306 x 30 =
4 x 530 =
2030105
-
46 =
6030 -
2030 =
60 - 2030105
-
46 =
4030simplify the above fraction
GCF(40, 30) = 10
4030
=
40 ÷ 1030 ÷ 10
=
43105
-
46 =
437
6/8
-
5/9
=
7/36
find the LCM for unlike denominators
LCM (8, 9) = 72
68
59
68
68
simplify the above fraction
GCF(14, 72) = 2
1472
68
LCM (8, 9) = 72
68
=
6 x 728 x 72 =
6 x 972 =
547259
=
5 x 729 x 72 =
5 x 872 =
407268
-
59 =
5472 -
4072 =
54 - 407268
-
59 =
1472simplify the above fraction
GCF(14, 72) = 2
1472
=
14 ÷ 272 ÷ 2
=
73668
-
59 =
7368
8/3
-
7/10
=
59/30
find the LCM for unlike denominators
LCM (3, 10) = 30
83
710
83
83
LCM (3, 10) = 30
83
=
8 x 303 x 30 =
8 x 1030 =
8030710
=
7 x 3010 x 30 =
7 x 330 =
213083
-
710 =
8030 -
2130 =
80 - 213083
-
710 =
59309
10/8
-
9/10
=
7/20
find the LCM for unlike denominators
LCM (8, 10) = 40
108
910
108
108
simplify the above fraction
GCF(14, 40) = 2
1440
108
LCM (8, 10) = 40
108
=
10 x 408 x 40 =
10 x 540 =
5040910
=
9 x 4010 x 40 =
9 x 440 =
3640108
-
910 =
5040 -
3640 =
50 - 3640108
-
910 =
1440simplify the above fraction
GCF(14, 40) = 2
1440
=
14 ÷ 240 ÷ 2
=
720108
-
910 =
72010
5/4
-
3/8
=
7/8
find the LCM for unlike denominators
LCM (4, 8) = 8
54
54
54
LCM (4, 8) = 8
54
=
5 x 84 x 8 =
5 x 28 =
10854
-
38 =
108 -
38 =
10 - 3854
-
38 =
78
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