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100

5/8  +  1/8  =

6/8  =  3/4

100

13/15  -  7/15 =

6/15 = 2/5

100

GCF =  16, 20

16 = 1X16 2X8 4X4 (1 2 4 8 16)

20 = 1x20 2x10 4x5 (1 2 4 5 10 20)

(1 2 4) = GCF = 4


100

5 3/4 =

23/4

100

LCM = 12 , 18

12 = 2 X 2 X 3

18 = 2 X 3 X 3

LCM = 2 X 2 X 3 X 3 = 36

200

 3/4  +   3/4  =

6/4 = 1 2/4 = 1 1/2

200

1 5/8  -  3/8 =

1 2/8 = 1 1/4

200

GCF = 9 21

9 = 1X9 3X3 (1 3 9)

21 = 1X21 3X7 (1 3 7 21)

GCF = 1 3 = 3

200

13 1/2

27/2

200

LCM = 6 , 8

6 = 6, 12, 18, 24

8 = 8, 16, 24

LCM = 24 

300

5/6  + 5/6 =

10/6 = 1 4/6 = 1 2/3

300

9 - 4 2/3 =

4 1/3

300

GCF = 8, 12

8 = 1X8 2X4 (1 2 4 8)

12 = 1X12 2X6 3X4 (1 2 3 4 6 12)

GCF = 1 2 4 = 4

300

9 9/11

108/11

300

LCM = 4,6

4 = 4, 8, 12

6 = 6, 12

LCM = 12

400

7/15 + 4/5 =

7/15 + 12/15 = 19/15 = 1 4/15

400

16 - 9 1/2 =

6 1/2

400

GCF = 6, 24

6 = 1X6 2X3 (1 2 3 6)

24 = 1X24 2X12 3X8 4X6  (1 2 3 4 6 8 12 24)

GCF = 1 2 3 6 = 6

400

 5 3/7

38/7

400

LCM = 5, 9

5 = 5 10 15 20 25 30 35 40 45

9 = 9 18 27 36 45

LCM = 45

500

1/4  + 7/12  =

3/12 + 7/12 = 10/12 = 5/6

500

8 1/2  -   1/4 =

8 2/4 - 1/4 = 8 1/4

500

GCF = 8 , 10

8 = 1X8 2X4 (1 2 4 8)

10 = 1X10 2X5 (1 2 5 10)

GCF = 1 2 = 2

500

6 2/9

56/9

500

LCM = 15, 20

15 = 15 30 45 60

20 = 20 40 60

LCM = 60

600

4/9  + 1/3 =

4/9 + 3/9 = 7/9

600

14 9/14  -  8 3/7 =

14 9/14 - 8 6/14 = 6 3/14

600

GCF = 10, 15, 30

10 = 1X10 2X5 (1 2 5 10)

15 = 1X15 3X5 (1 3 5 15)

30 = 1X30 2X15 3X10 5X6 (1 2 3 5 6 10 15 30)

GCF = 1 2 5 = 5

600

18 1/4

73/4

600

LCM = 6 , 14

6 = 6 12 18 24 30 36 42

14 = 14 28 42

LCM = 42

700

3/4  + 1/2  = 

3/4 + 2/4 = 5/4 = 1 1/4

700

23 5/6   -   15 2/3 =

23 5/6 - 15 4/6 = 8 1/6

700

GCF = 24, 36, 48

24 = 1X24 2X12 3X8 4X6 = (1 2 3 4 6 8 12 24)

36 = 1X36 2X18 3X12 4X9 6X6 (1 2 3 4 6 9 12 18 36)

48 = 1X48 2X24 3X16 4X12 6X8 (1 2 3 4 6 8 12 16 24 48)

GCF = 1 2 3 4 6 12 = 12

700

10 2/3

32/3

700

LCM = 7, 21

7 = 7 14 21 28 35 42

21 = 21 42

LCM = 42