Erbijsommen t/m 40
Optellen
| 1. | 20 + 18 = |
20
|
38
|
40
|
44
|
| 2. | 19 + 17 = |
36
|
31
|
21
|
38
|
| 3. | 12 + 4 = |
15
|
13
|
11
|
16
|
| 4. | 19 + 8 = |
35
|
25
|
31
|
27
|
| 5. | 10 + 8 = |
20
|
18
|
15
|
19
|
| 6. | 16 + 10 = |
48
|
26
|
42
|
25
|
| 7. | 18 + 8 = |
50
|
26
|
32
|
34
|
| 8. | 4 + 1 = |
7
|
5
|
10
|
2
|
| 9. | 12 + 11 = |
39
|
28
|
48
|
23
|
| 10. | 20 + 13 = |
20
|
24
|
33
|
35
|
| 11. | 16 + 11 = |
49
|
43
|
27
|
42
|
| 12. | 10 + 8 = |
17
|
18
|
20
|
16
|