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