Show:
adding
subtracting
multi digit questions
adding and subtracting
100

16 + 9

25

100

10 - 7

3

100

1010 + 150

1160

100

5 + 5

10

200

10 + 5

15

200

15 - 5

10

200

1025 + 125

1150

200

19 - 15 

4

300

21 + 7

28

300

17 - 15

2

300
2156 - 956

1200

300

31 + 9

40

400

9 + 17

26

400

17 - 10

7

400

1125 + 265

1390

400

15 - 7

8

500

40 + 40

80

500

21 - 9

12

500

5178 + 168

5346

500

15 + 7

22