Add and Subtract Fractions. Brigitte Steinmetz Beyond Limits Education. Objectives. To add/subtract fractions that have common denominators. To add/subtract fractions that have uncommon denominators using the least common denominator.
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38
58
+
Now add them together.
1/8
1/8
1/8
1/8
1/8
1/8
1/8
1/8
58
38

Now subtract 3 eights.
1/8
1/8
1/8
1/8
1/8
12
14
+
Now add them together.
+
12
14
23
12

Now subtract 1 half.
16
13
16

12
16
13
16
38
45
+
1/8
4/8
5/8
6/8
7/8
8/8
2/8
3/8
1/2
0
1
1
2
38
close to
38
45
+
2/5
3/5
1/5
4/5
1/2
0
1
45
close to
1
38
45
+
1
2
1
2
+
=
1
1
23
14
+
Now add them together.
16
13
16
16
13
14
16
23
Multiples of 3: 3, 6, 9, 12
Multiples of 4: 4, 8, 12
14
1/12
16
13
1/12
1/12
16
1/12
1/12
1/12
LCD = 12
16
13
1/12
1/12
14
1/12
1/12
1/12
1/12
16
1/12
1/12
1/12
1/12
34
16

Now subtract 1 sixth.
14
14
14
16
34
Multiples of 4: 4, 8, 12
Multiples of 6: 6, 12
1/12
16
14
1/12
1/12
1/12
14
1/12
1/12
LCD = 12
1/12
1/12
1/12
16
1/12
14
1/12
1/12
1/12
1/12
1/12
1/12
3
8
14
2
+
1
Now add them together.
1
1
1
1/8
14
1/8
1/8
3
8
2
Multiples of 4: 4, 8
Multiples of 8: 8
14
1
1
1
1
LCD = 8
1/8
14
1/8
1/8
1/8
1/8
3
8
14
2

1
Now subtract one and one fourth.
1
1
1/8
1/8
1/8
3
8
2
Multiples of 4: 4, 8
Multiples of 8: 8
14
1
1
1
1
LCD = 8
1/8
14
1/8
1/8
1/8
1/8
3
8
1
2

Now subtract one and three eighths.
1
1
8
8
1
2
=
1/8
1
1
1
1/8
1/8
1/8
1/8
1/8
1/8
1/8
3
8
1
2

8
8
1
1/8
1
1/8
3
8
1

1/8
1/8
1/8
5
8
1/8
1/8
1/8