Adding

1
Adding Subtracting Fractions with Unlike
Denominators
2
Steps for solving addition and subtraction of
fractions with unlike denominators

1. Find the LCD
2. Write equivalent fractions
3. Add or Subtract
4. Simplify the answer

3
LowestTerms
LCD
Problem Equivalent Fraction
5
x 1
8 - 8,16 4 - 4,8

8
x 1
2
x 2

LCD 8

8
x 2
7
8
4
LowestTerms
LCD
Problem Equivalent Fraction
2
x 2
6 - 6,12 4 - 4,8,12

12
x 2
9
x 3

LCD 12

12
x 3
11
12
5
LowestTerms
LCD
Problem Equivalent Fraction
6
x 2
5 - 5,10 2-2,4,6,8,10

10
x 2
5
x 5

LCD 10

10
x 5
11

10
6
LowestTerms
LCD
Problem Equivalent Fraction
10
x 5
5 - 5,10,15 3-3,6,9, 12,15

15
x 5
3
x 3
-

15
LCD 15
x 3
7
15
7
LowestTerms
LCD
Problem Equivalent Fraction
6
x 1
8 - 8 2 - 2,4,6,8

8
x 1
4
x 4
-

8
LCD 8
x 4
2
2

8
2