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Adding Fractions

Arrrr ya ready?!?!

Adding Like Denominators

Only add the numerators

1/4

1/4

3

1

4

4

4

4

1/4

1/4

1

Add these fractions

1/5

1/5

3

1

4

1/5

5

5

5

1/5

Add these fractions

1/4

1/4

2

1

3

4

4

4

1/4

Add these fractions

1

1

1

6

6

6

5

2

3

6

6

6

1

1

6

6

Add these fractions

1

1

1

1

6

6

6

6

4

2

2

2

2

6

6

6

2

3

ALWAYS SIMPLIFY YOUR ANSWER!

Add these fractions

8

4

2

3

5

4

3

12

12

12

SIMPLIFY!!!

Add these fractions

4

2

2

3

1

2

5

10

10

10

WOO WOO!!!!!

Find a common denominator

Adding Unlike Denominators

Check to see if the smaller denominator divides

evenly into the larger denominator. If it does,

use the larger denominator.

For example

1

3 will divide evenly into 9, so 9 is your common

denominator.

3

1

9

To Add Fractions With Unlike Denominators

- Rewrite the fractions using a common

denominator.

1

5

10

1

10

10

To Add Fractions With Unlike Denominators

- Find the equivalent fractions with 10 as the

denominator.

To find the top number, ask yourself what do you

multiply the 5 by to get 10?

1

5

10

1

10

10

To Add Fractions With Unlike Denominators

- Find the equivalent fractions with 10 as the

denominator.

Whatever you multiply the denominator by, you

must also multiply by the numerator!

1

x 2

5

10

x 2

1

10

10

To Add Fractions With Unlike Denominators

- Find the equivalent fractions with 10 as the

denominator.

To find the top number just multiply 2 x 1 to get

your equivalent fraction.

1

2

x 2

5

10

x 2

1

10

10

To Add Fractions With Unlike Denominators

- Find the equivalent fractions with 10 as the

denominator.

1

2

What do you multiply the 10 by to get 10??

x 2

5

10

x 2

1

1

x 1

10

10

x 1

To Add Fractions With Unlike Denominators

- Now just add the numerators.

1

2

x 2

Remember when adding fractions you never add the

denominators.

5

10

x 2

x 1

1

1

10

10

x 1

3

10

Add these Fractions

Use the short cut to find a common denominator.

1

2

8

1

8

8

Add these Fractions

Now find equivalent fractions.

1

2

8

x 4

1

8

8

x 1

What do you multiply 2 by to get 8?

What do you multiply 8 by to get 8?

Add these Fractions

Since you are writing equivalent fractions,

now multiply the numerators by the same number

you did in the denominators.

1

x 4

2

8

x 4

1

x 1

8

8

x 1

Add these Fractions

1

Now multiply across.

4

x 4

2

8

x 4

1

1

x 1

8

8

x 1

Add these Fractions

1

Add your new numerators.

4

x 4

2

8

x 4

1

1

x 1

8

8

x 1

5

8

Arrrrgg matey! These youngins think they arrr

smarrrt. Lets see if they can handle this

one.arrgg!!

Add these Fractions

Find a common denominator by finding the LCM

of 5 and 3.

2

5

15

1

3

15

Add these Fractions

Ask yourself what you multiply the denominator by

to get 15.

2

5

15

x 3

1

3

15

x 5

Add these Fractions

Multiply the numerator by the same number you did

in the bottom.

2

x 3

5

15

x 3

1

x 5

3

15

x 5

Add these Fractions

Multiply across.

2

6

x 3

5

15

x 3

1

5

x 5

3

15

x 5

Add these Fractions

Now add your new numerators.

2

6

x 3

5

15

x 3

1

5

x 5

3

15

x 5

11

15

DRATS!!!! These youngins are smarty pants. We

are really gonna have to stump em now

Add these Fractions

1

2

x 2

6

12

x 2

1

3

x 3

4

12

x 3

5

12

ARGG!!!! How did you get so smart?? You must

have one awesome teacher. ?

Add these Fractions

2

6

x 3

3

9

x 3

1

1

x 1

9

9

x 1

7

9

AYE! That was an easy one!!!! Heres a tough one

fer ya..

Add these Fractions

5

20

x 4

6

24

x 4

3

9

x 3

8

24

x 3

29

24

Simplify Your Answer

5

1

24

29

24)

29

24

24

5

Ahoy! Did that one get ya?? Try one more

Add these Fractions

4

12

x 3

5

15

x 3

2

10

x 5

3

15

x 5

22

15

Simplify Your Answer

7

1

15

22

15)

22

15

15

7

Aye, you kiddos are too smart fer me. Good luck

on yer assignment WS C-39!!

but first.....

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