Erafsommen t/m 20
Aftrekken
| 1. | 16 - 7 = |
9
|
7
|
3
|
10
|
| 2. | 9 - 2 = |
8
|
7
|
1
|
3
|
| 3. | 13 - 13 = |
9
|
10
|
0
|
2
|
| 4. | 3 - 2 = |
8
|
1
|
6
|
10
|
| 5. | 18 - 16 = |
7
|
2
|
1
|
5
|
| 6. | 16 - 9 = |
5
|
9
|
7
|
3
|
| 7. | 13 - 11 = |
4
|
1
|
3
|
2
|
| 8. | 20 - 4 = |
12
|
14
|
13
|
16
|
| 9. | 20 - 1 = |
18
|
19
|
11
|
13
|
| 10. | 17 - 5 = |
12
|
16
|
20
|
17
|
| 11. | 10 - 4 = |
9
|
5
|
7
|
6
|
| 12. | 17 - 12 = |
1
|
2
|
8
|
5
|