Adding same sign
Adding opposite sign
Subtracting Same sign
100

2/5+4/5=

6/5 


1 1/5

100

-7/12+5/6

3/12=1/4

100

5/4-3/4

2/4=1/2

200

-1/6+(-5/6)

-6/6


-1

200

-7/16+3/8

-1/16

200

1/3-(-5/6)

6/6=1

300

-1/3+(-3/8)

-17/24

300

-2/3+3/7

-6/21=-2/7

300

6-1/6

5 5/6

400

5/6+5/12

15/12


1 3/12=1 1/4

400

-9/8+1/4

-7/8

400
-4/5-7/8

-67/40


-1 27/40

500

-7/8+(-2/7)

-65/56


-1 9/56

500

7/9+(-2/5)

17/45

500

-7/9-1/3

-10/9


-1 1/9

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