Show:
Addition (+)
Addition (+/-)
Subtraction (+)
Subtraction (+/-)
Subtraction (- -)
100

12 + 9

21

100

5 + (-2)

3

100

10-5

5

100

-5 - 10

-15

100

12 - (-5)

17

200

14+17

31

200

-3 + 8

5

200

14-7

7

200

-13 - 4

-17

200

45 - (-20)

65

300

45 + 7

52

300

- 12 + (-19)

-31

300

38-21

17

300

-23 - 5

-28

300

-25 - (-18)

7

400

932 + 423

1355

400

321 + (-9)

312

400

265 - 121

144

400

-865 - 10

-875

400

-47 - (-56) 

9