Addition
Addition HARD
100

-7+2

-5

100

10200+1200

11400

200

4+-1

3

200

200+-120

80

300

-5+2

-3

300

90812+-1456

89356

400

12+-3

9

400

200+-100

100

500

12900+-2900

10000

500

20000+10000

10000