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Addition w/o exchanges
Addition w/ exchanges
Mystery?
Subtraction w/o exchanges
Subtraction w/ exchanges
100

3.4+5.2

8.6

100

3.8+7.9

11.7

100

3.56-1.43

2.13

100

8.9-5.3

3.6

100

5.4-2.9

2.5

200

10.3+6.4

16.7

200

12.8+29.4

42.2

200

12.8-8.92

3.88

200

12.5-8.3

4.2

200

23.4-18.7

4.7

300

24.8+11.1

35.9

300

34.5+87.8

122.3

300

54.98-12.3

42.68

300

25.7-12.4

13.3

300

34.7-28.9

5.8

400

50.7+3.2

53.9

400

124.7+191.7

316.4

400

432.76-345.78

86.98

400

46.8-32.6

14.2

400

63.6-58.9

4.7

500

124.4+52.5

176.9

500

589.9+434.5

1024.4

500

562.89-425.76

127.13

500

535.9-221.5

314.4

500
216.3-159.8

56.5