Show:
Counting
Addition - One Digit
Subtraction- One Digit
Addition- Two Digits
Subtraction- Two Digits
100

5

* * * * *

100

7+7=

14

100

9 - 4=

5

100

12 + 12 = 

24

100

24 - 12 = 

12

200

10

* * * * *

* * * * *

200

2+4=

6

200

4 - 0 = 

4
200

30 + 14 = 

44

200

44 - 14 = 

30

300

20

* * * * *   * * * * *

* * * * *   * * * * *

300

9 + 9=

18

300

7 - 3 = 

4

300

51 + 39 = 

90

300

90 - 39 = 

51

400

8

* * * * *

* * *

400

9+7=

16

400

9 - 0 =

9

400

64 + 28 = 

92

400

92 - 64 = 

28

500

14

* * * * *   * * * * *

* * * *

500

8+7=

15

500

6 - 6 = 0

0

500

50 + 28 = 

78

500

50 - 38 = 

22