Erbijsommen tot en met 20
Erbijsommen
| 1. | 9 + 4 = |
13
|
18
|
14
|
11
|
| 2. | 9 + 1 = |
9
|
10
|
5
|
7
|
| 3. | 9 + 7 = |
16
|
13
|
11
|
20
|
| 4. | 7 + 5 = |
12
|
20
|
18
|
11
|
| 5. | 7 + 2 = |
9
|
5
|
3
|
7
|
| 6. | 7 + 6 = |
11
|
13
|
17
|
16
|
| 7. | 8 + 5 = |
20
|
12
|
13
|
10
|
| 8. | 8 + 2 = |
3
|
7
|
10
|
4
|
| 9. | 10 + 7 = |
17
|
18
|
16
|
13
|
| 10. | 9 + 4 = |
14
|
20
|
17
|
13
|
| 11. | 8 + 2 = |
2
|
10
|
8
|
5
|
| 12. | 8 + 4 = |
13
|
11
|
12
|
17
|