Show:
adding
subtraction
adding 2
subtraction 2
adding 3
100

22+10

32

100

14-7

7

100

50+15

65

100

100-16

84

100

200+60

260

200

45+5

50

200

29-10

19

200

19+19

38

200

92-12

80

200

119+30

149

300

19+11

30

300

11-5

6

300

100+32

132

300

88-27

61

300

212-51

161

400

10+ 15

25

400

15-9

6

400

105+25

130

400

200-46

154

400

243+111

354

500

20+17

37

500

32-8

24

500

99+14

113

500

199-48

151

500

208+87

295