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