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