Adding Fractions Arrrr ya ready?!?! Adding Like Denominators 1/4 3 4 1 4 4 4 + = Only add the numerators = 1

Adding FractionsAdding Fractions

Arrrr ya ready?!?!

Adding Adding LikeLike DenominatorsDenominators

1/434

1/4

1/414

44

1/4

+ =

Only add the numeratorsOnly add the numerators

= 1

Add these fractionsAdd these fractions

1/5

1/51/5

1/5

35

15

+ =45


1/4

1/4

1/424

14

+ =34


56

26

36

+ =

16

16

16

16

16


46

26

26

+ =

16

16

16

16

=22

23

÷

ALWAYS SIMPLIFY YOUR ANSWER!


312

512

+ = 812

=44

23

÷

SIMPLIFY!!!


310

110

+ = 410

=22

25

÷

WOO WOO!!!!!

**Find a common **Find a common denominator**denominator**

1319+

Check to see if the smaller denominator divides evenly into the larger denominator.If it does, use the larger denominator.

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

Adding Adding UnlikeUnlike Denominators Denominators

For example:

To Add Fractions With To Add Fractions With Unlike DenominatorsUnlike Denominators

Rewrite the fractions using a Rewrite the fractions using a common denominator.common denominator.

151

10 +

10

10


Find the equivalent fractions Find the equivalent fractions with 10 as the denominator.with 10 as the denominator.

151

10 +

10

10

To find the topnumber, ask yourselfwhat do you multiplythe 5 by to get 10?



151

10 +

10

10

Whatever you multiply the

denominator by, you must also multiply by the

numerator!

x 2 =x 2 =



151

10 +

10

10

To find the top number

just multiply 2 x 1 toget your equivalent

fraction.

x 2 =x 2 = 2



151

10 +

10

10

What do you multiply the 10 by to get 10??1

x 1=x 1 =x 2 =x 2 = 2


Now just add the Now just add the numerators.numerators.1

51

10 +

10

10

Remember when

adding fractions you

never add the denominators.

1x 2 =x 2 = 2

103

x 1 =x 1 =

Add these FractionsAdd these Fractions

1218+

Use the shortcut to find a

commondenominator.

8

8


1218+

Now find equivalentfractions.

8

8x 1 =

x 4 =

What do you multiply 2 by to get 8?

What do you multiply 8 by to get 8?


1218+

Since you arewriting equivalent

fractions, nowmultiply the

numerators by thesame number you

did in the denominators.

8

8x 1 =

x 4 =x 1 =

x 4 =


1218+

Now multiplyacross.

8

8x 1 =

x 4 =x 1 =

x 4 =

1

4


1218+

Add yournew

numerators.

8

8x 1 =

x 4 =x 1 =

x 4 =

1

4

58

Arrrrgg matey! These young’ins think they arrr

smarrrt. Let’s see if they can handle this one….arrgg!!


2513+

Find a common denominator

by finding the LCM of 5 and 3.

15

15


2513+

Ask yourselfwhat you

multiply thedenominatorby to get 15.

15

15x 5 =

x 3 =


2513+

Multiply thenumerator

by the samenumber you

did in thebottom.

15

15x 5 =

x 3 =x 5 =

x 3 =


2513+

Multiplyacross.

15

15x 5 =

x 3 =x 5 =

x 3 =

5

6


2513+

Now addyour new

numerators.15

15x 5 =

x 3 =x 5 =

x 3 =

5

6

1115

DRATS!!!! These young’ins are

smarty pants. We are really gonna have to stump ‘em now……


1614+

12

12x 3 =

x 2 =x 3 =

x 2 =

3

2

512

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

must have one awesome

teacher….


2319+

9

9x 1 =

x 3 =x 1 =

x 3 =

1

6

79

AYE! That was an easy

one!!!! Here’s a tough one

fer ya…..


5638+

24

24x 3 =

x 4 =x 3 =

x 4 =

9

20

2924

Simplify Your AnswerSimplify Your Answer

2924 24) 29

1

524

524

Ahoy! Did that one get

ya?? Try one

more………


4523+

15

15x 5 =

x 3 =x 5 =

x 3 =

10

12

2215

Simplify Your AnswerSimplify Your Answer

2215 15) 22

1

157

715

Aye, you kiddos are too smart fer me. Good

luck on yer assignment… WS C-39!!

Documents

Adding Fractions Arrrr ya ready?!?! Adding Like Denominators 1/4 3 4 1 4 4 4 + = Only add the numerators = 1