Adding and Subtracting Fractions with

Different Denominators
2 5 3 27
+ + =
3 6 4 12
×4 ×2 ×3

2 8 5 10 3 9
3 12 6 12 4 12

×4 ×2 ×3

Convert the fractions so that they have the same denominator by finding a common multiple
of the denominators. Then, add or subtract the numerators.

1) 3 3 4
+ +
8 4 6
× × ×

3 + 3 + 4 =
8 28 4 24 6 24 24

× × ×

2) 1 2 4 3) 1 3 7
+ + + +
3 4 6 5 4 10

+ + = + + =
12 12 12 12 20 20 20 20

4) 3 1 5) 4 1
− −
6 10 5 3 Can you find a
common multiple
of 5 and 3 to use as
− = − =
30 30 30 the denominator?

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 Adding and Subtracting Fractions with
Different Denominators
2 5 3 27
+ + =
3 6 4 12
×4 ×2 ×3

2 8 5 10 3 9
3 12 6 12 4 12

×4 ×2 ×3

Convert the fractions so that they have the same denominator by finding a common multiple
of the denominators. Then, add or subtract the numerators.

1) 3 5 1
+ +
5 6 3
× × ×

3 + 5 + 1 =
5 30 6 30 3 30 30

× × ×

2) 5 1 3) 7 11 2
− + +
6 9 8 12 4

+ = + + =
18 18 18 24 24 24 24
4) 4 1 5) 4 1 3
− + +
8 7 9 6 4

− = + + =

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 Adding and Subtracting Fractions with
Different Denominators
2 5 3 27
+ + =
3 6 4 12
×4 ×2 ×3

2 8 5 10 3 9
3 12 6 12 4 12

×4 ×2 ×3

Convert the fractions so that they have the same denominator by finding a common multiple
of the denominators. Then, add or subtract the numerators.

1) 3 1 2) 7 4 2
− + +
8 5 9 4 3

− = + + =
40 40 40 45 45 45 45

3) 15 7 4) 6 11 4
− + +
16 12 18 12 9

− = + + =

5) 5 7 3 6) 13 6
+ + −
8 11 4 16 10

+ + = − =

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