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