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