Erafsommen t/m 20
Aftrekken
| 1. | 9 - 3 = |
6
|
9
|
4
|
7
|
| 2. | 10 - 7 = |
6
|
3
|
8
|
10
|
| 3. | 14 - 9 = |
6
|
7
|
9
|
5
|
| 4. | 15 - 5 = |
7
|
10
|
2
|
1
|
| 5. | 16 - 9 = |
7
|
2
|
3
|
4
|
| 6. | 14 - 7 = |
7
|
3
|
1
|
6
|
| 7. | 8 - 3 = |
10
|
5
|
1
|
8
|
| 8. | 20 - 17 = |
3
|
6
|
1
|
2
|
| 9. | 10 - 4 = |
4
|
1
|
2
|
6
|
| 10. | 10 - 3 = |
2
|
10
|
7
|
9
|
| 11. | 9 - 7 = |
1
|
5
|
2
|
3
|
| 12. | 2 - 1 = |
10
|
7
|
4
|
1
|