Erbijsommen t/m 20
Optellen
| 1. | 10 + 9 = |
19
|
10
|
11
|
17
|
| 2. | 10 + 9 = |
13
|
15
|
12
|
19
|
| 3. | 9 + 5 = |
18
|
10
|
12
|
14
|
| 4. | 8 + 3 = |
17
|
11
|
10
|
13
|
| 5. | 8 + 2 = |
10
|
3
|
9
|
2
|
| 6. | 9 + 6 = |
20
|
15
|
10
|
19
|
| 7. | 7 + 6 = |
14
|
11
|
19
|
13
|
| 8. | 7 + 6 = |
20
|
13
|
15
|
12
|
| 9. | 10 + 8 = |
19
|
18
|
17
|
14
|
| 10. | 10 + 7 = |
14
|
10
|
17
|
13
|
| 11. | 10 + 9 = |
19
|
18
|
14
|
12
|
| 12. | 10 + 8 = |
18
|
16
|
12
|
13
|