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