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