Grades 6-8 Fcat 2.0 Mathematics Reference Sheet Page 5
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20Objective: Add and subtract fractions and mixed numbers and express answers in simplest form.
Adding and Subtracting Fractions:
1) determine the least common denominator (LCD) of the fractions
2) rewrite each fraction as an equivalent fraction using the LCD
3) Add or subtract the fractions
4) Simplify if necessary
1
3
3
1
EX: Add
EX: Subtract
3
1
2
8
5
6
1) LCD of 2 and 8 is 8
1) LCD of 5 and 6 is 30
1
4
3
18
3
2)
2)
3
2
8
5
30
3
3
1
5
1
1
8
8
6
30
7
13
3)
3)
2
8
30
4) (can’t be simplified)
4) (can’t be simplified)
4
1
11
5
1.)
2.)
6
3
12
8
3
3
5
4
3.)
4.)
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2
3
1
8
4
6
5
6.)
Marty weighs 64 ¼ pounds and Nathan weighs 76 ½
1
5.) Shelly has two pieces of yarn. One is
yards long
1
pounds. How much more does Nathan weigh than
2
Marty?
3
and the other is
yards long. How much yarn does
2
4
she have altogether?
5
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