Erafsommen t/m 20
Aftrekken
| 1. | 13 - 7 = |
2
|
8
|
6
|
5
|
| 2. | 18 - 1 = |
16
|
17
|
10
|
12
|
| 3. | 20 - 3 = |
14
|
19
|
17
|
12
|
| 4. | 15 - 14 = |
1
|
7
|
6
|
3
|
| 5. | 10 - 6 = |
5
|
4
|
10
|
9
|
| 6. | 20 - 6 = |
14
|
19
|
10
|
13
|
| 7. | 3 - 1 = |
2
|
1
|
10
|
6
|
| 8. | 16 - 7 = |
7
|
1
|
9
|
6
|
| 9. | 14 - 13 = |
6
|
4
|
1
|
9
|
| 10. | 19 - 15 = |
10
|
7
|
5
|
4
|
| 11. | 8 - 3 = |
5
|
10
|
3
|
8
|
| 12. | 12 - 6 = |
6
|
8
|
7
|
2
|