Subtract a Fraction from Unlike Fraction

Name Grade School
Date Questions10 Score

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
=

Answers Key
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

Subtracting Fractions with Unlike Denominators Worksheet

Subtracting unlike fraction worksheet with answers to practice & learn 6th grade math problems is available online for free in printable & downloadable (pdf & image) format. Tap on PRINT, PDF or IMAGE button to print or download this grade-6 fractions worksheet to practice subtracting fractions with different denominators.

How to Use this Worksheet

In this sixth grade fraction worksheet, students are required to find the difference between two fractions with different denominators. For subtracting fractions with unlike denominators, find the LCD of denominators, multiply LCD with both numerator and denominator of each fraction, simplify the fractions to have equal denominators and find the difference between the numerators. The difference between the numerators divided by the common denominator is the resulting difference of two unlike fractions.

Answers Key

Teachers, tutors, parents or students can check or validate the solved questions by using the corresponding answers key which comprises the step by step work on how to subtract a fraction from unlike fraction.

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