Show:
Subtract within 100
Break Apart 2nd addend
add to subtract
compensation
100

45-13

32

100

75-35

40

100

45-34

11

100

52-43

9

200

47-29

18

200

41-3

38

200

13-4

9

200

64-24

40

300

26-5

21

300

100-73

27

300

15-15

0

300

16-4

12

400

14-8

6

400

27-15

12

400

46-12

34

400

95-32

63