Erbijsommen tot en met 20
Erbijsommen
| 1. | 7 + 1 = |
9
|
6
|
2
|
8
|
| 2. | 4 + 3 = |
6
|
7
|
1
|
5
|
| 3. | 9 + 9 = |
13
|
18
|
16
|
14
|
| 4. | 9 + 7 = |
16
|
20
|
19
|
18
|
| 5. | 5 + 3 = |
5
|
8
|
1
|
3
|
| 6. | 8 + 6 = |
14
|
10
|
20
|
11
|
| 7. | 7 + 1 = |
3
|
9
|
2
|
8
|
| 8. | 5 + 4 = |
10
|
3
|
9
|
1
|
| 9. | 9 + 5 = |
10
|
14
|
12
|
19
|
| 10. | 6 + 4 = |
5
|
6
|
10
|
4
|
| 11. | 6 + 3 = |
4
|
3
|
2
|
9
|
| 12. | 6 + 3 = |
7
|
9
|
3
|
2
|