Show:
Adding 1 digits
Subtracting 1 digit
Adding 2 digits
Subtracting 2 digits
adding / subtracting
100

4 + 2 =

6

100

7 - 6 =

1

100
11 + 3 =

14

100

12 - 10 =

2

100

10 + 4 = 

14

200

3 + 5 =

8

200

9 - 6 =

3

200

28 + 15 = 

43

200

22 - 15 = 

7

200

22 - 15 =

 7

300

6 + 4 =

10

300

8 - 2 =

6

300

30 + 25 = 

55

300

45 - 32 =

13

300

50 + 13 = 

63

400

9 + 8 =

17

400

9 - 4 = 

5

400

42 + 31 = 

73

400

55 - 10 =

45

400

45 - 6 =

39

500

10 + 9 =

19

500

8 - 8 =

0

500

50 + 45 =

95

500

80 - 45 =

35

500

25 + 25 = 

100