Skelly's fractions

common denominators

100

3/4      2/16

16 or 64

200

1/5     2/10

  10 or 50

300

1/3     1/4    

12

400

2/3     3/8             

24

500

1/2     2/3

  6

adding common denominators

100

23/40   plus 11/40

   34/40

200

5/12    plus 7/12

12/12 or 1

300

7/16  plus 7/16 =

14/16  

400

4/5 + 9/5 = 

13/5   or 2 3/5

500

5 1/2  + 5 1/2 = 

11 /2  or 2 1/2

adding unlike denominators

100

4/5  + 1/4=

21/20  = 1 1/20

200

2/3 + 3/6=

7/6  or 1 1/6

300

4/6 + 4/8 =

28/24  or 1 4/24

400

2/3 + 1/8 

19/24

500

12/8

1 4/8

adding mixed numbers

100

2 1/3 + 3 1/4

5 7/12

200

14 1/3 + 6 1/5

20 8/15

300

15 1/3 + 4 2/3  

20

400

8 2/3 + 5 1/2

14 1/6

500

3 2/4 + 1 7/8=

5 3/8

coverting improper fractions into mixed numbers

100

9/5

 1 4/5

200

16/5

3 1/5

300

38/5

7 3/5

400

91/10

^{9 1/10}