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