Show:
adding
subtracting
adding 2 digit
subtracting 2 digit
Adding 3 numbers
100

12+4

16

100

8-6

2

100

22+8

30

100

23-12

11

100

4+8+2

14

200

18+4

22

200

16-14

2

200

34+12

46

200

27-20

7

200

12+1+10

23

300

21+8

29


300

20-7

13

300

45+23

68

300

35-17

18

300

13+7+4

24

400

27+9

36

400

24-12

12

400

53+45

98

400

41-29

12

400

6+9+3

18

500

30+7

37

500

24-15

9

500

67+55

122

500

52-41

11

500

16+2+3

21