Adding and Subtracting Fractions Review

When adding fractions you MUST have a common denominator!

3

4

1 5_

+

x5 =

5 =

15

20

4 =

4 =x 4

20

19

20

Find the smallest number that both 4and 5 will go into.

This number is 20. Then multiply both the numerator and denominator to get to 20.

Once you have a common denominator, then add!

6th Grade HomePage

5

6

2

3

X

X

X

X

1

1

2

2

5

6

4

6

To subtract fractions you must have a

common denominator!

Find the least common

multiple for 3 and 6. (In this case, 6) Then

multiply!

1

6

This is your answer!

QUIZ

6th Grade HomePage

We need a common denominator to add

these fractions.

We need a common denominator to add

these fractions.

5, 10, 15, 20, 25, 30, 35, 40, 45

7, 14, 21, 28, 35, 42, 49, 56, 63

We need a common denominator to add

these fractions.

7, 14, 21, 28, 35, 42, 49, 56, 63

8, 16, 24, 32, 40, 48, 56, 64, 72

We need a common denominator to add

these fractions.

3, 6, 9, 12, 15, 18, 21, 24, 27

5, 10, 15, 20, 25, 30, 35, 40, 45

We need a common denominator to add

these fractions.

3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33

11, 22, 33, 44, 55, 66, 77…

We need a common denominator to add

these fractions.

3, 6, 9, 12, 15, 18, 21, 24, 27

6, 12, 18, 24,…

We need a common denominator to

subtract one fractionfrom another.

2, 4, 6, 8, 10, 12, 14, 16, 18, 20 …

10, 20, 30…

x 1

x 1

x 5

x 5

2

5 – 3 = 2

5

3

Try These

A

F

EB

C

D