Adding & Subtracting Fractions

Steps of Operation

10

What is the last step of factoring?

Simplify

20

Which step do we rewrite the fraction with the common denominator?

Step 2

30

What is done to the bottom, must be...?

Done to the top

40

How do we find the common denominator?

By finding the Least Common Multiple for both numbers

LeastCommon Multiple

10

Find the least common multiple for:

3 & 12

12

20

Find the least common multiple for...

3 & 5

15

30

Find the least common multiple for...

11 & 44

44

40

Find the least common multiple for...

8 & 32

64

50

Find the least common multiple for...

18 & 24

72

AddingFractions

10

2/4 + 1/4 =

3/4

20

1/3 + 3/6 =

5/6

30

7/20 + 3/10 =

13/20

40

7/36 + 4/9 =

23/36

50

1/2 + 3/5 + 7/3 =

15/30 + 18/30 + 70/30

103/30

3 13/30

Subtracting Fractions

10

3/5 - 1/5 =

2/5

20

5/9 - 1/3 =

2/9

30

2/9 - 1/6 =

1/18

40

4/7 - 4/8 =

1/14

50

48/17 - 2/4 =

192/68 - 34/68

158/68

79/34

2 11/34