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