Erafsommen t/m 20
Aftrekken
| 1. | 14 - 2 = |
10
|
19
|
14
|
12
|
| 2. | 17 - 4 = |
10
|
13
|
19
|
20
|
| 3. | 18 - 1 = |
10
|
16
|
13
|
17
|
| 4. | 11 - 11 = |
6
|
0
|
5
|
9
|
| 5. | 17 - 5 = |
10
|
12
|
20
|
16
|
| 6. | 9 - 7 = |
10
|
9
|
1
|
2
|
| 7. | 19 - 6 = |
14
|
20
|
13
|
15
|
| 8. | 15 - 3 = |
15
|
16
|
12
|
14
|
| 9. | 20 - 16 = |
10
|
1
|
9
|
4
|
| 10. | 9 - 1 = |
5
|
7
|
8
|
6
|
| 11. | 17 - 15 = |
4
|
2
|
5
|
9
|
| 12. | 11 - 1 = |
1
|
9
|
10
|
7
|