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