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