Adding up to 10
Adding up to 20
Subtraction up to 10
Subtraction up to 20
100

4 + 1

5

100

12 + 1

13

100

3 - 1

2

100

13 - 2

11

200

3 + 4

7

200

11 + 4

15

200

5 - 2

3

200

14 - 3

11

300

2 + 7

9

300

15 + 5

20

300

8 - 4

4

300

18 - 1

17

400

7 + 3

10

400

13 + 6

19

400

10 - 4

6

400

20 - 5

15