Erafsommen t/m 15
Aftrekken
| 1. | 2 - 1 = |
1
|
5
|
7
|
4
|
| 2. | 5 - 3 = |
6
|
2
|
7
|
1
|
| 3. | 2 - 1 = |
5
|
1
|
8
|
4
|
| 4. | 1 - 1 = |
5
|
4
|
0
|
7
|
| 5. | 4 - 2 = |
8
|
1
|
6
|
2
|
| 6. | 5 - 2 = |
6
|
3
|
9
|
7
|
| 7. | 3 - 2 = |
8
|
1
|
2
|
6
|
| 8. | 3 - 1 = |
2
|
1
|
6
|
7
|
| 9. | 3 - 2 = |
1
|
6
|
2
|
9
|
| 10. | 4 - 3 = |
1
|
6
|
10
|
4
|
| 11. | 4 - 1 = |
2
|
3
|
9
|
4
|
| 12. | 1 - 1 = |
0
|
10
|
1
|
3
|