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