Erbijsommen tot en met 30
Erbijsommen
| 1. | 13 + 4 = |
15
|
12
|
17
|
18
|
| 2. | 8 + 1 = |
7
|
8
|
4
|
9
|
| 3. | 13 + 8 = |
28
|
44
|
21
|
22
|
| 4. | 15 + 4 = |
11
|
19
|
17
|
10
|
| 5. | 13 + 6 = |
20
|
15
|
19
|
11
|
| 6. | 9 + 9 = |
10
|
20
|
17
|
18
|
| 7. | 5 + 3 = |
2
|
9
|
8
|
5
|
| 8. | 12 + 2 = |
18
|
20
|
19
|
14
|
| 9. | 11 + 9 = |
17
|
10
|
19
|
20
|
| 10. | 15 + 3 = |
12
|
18
|
16
|
11
|
| 11. | 12 + 7 = |
15
|
18
|
19
|
16
|
| 12. | 13 + 3 = |
16
|
17
|
20
|
19
|