Reken de erbijsom tot 20 uit
Erbijsommen
|
1.
12 + 1 =
|
2.
17 + 1 =
|
3.
7 + 12 =
|
|
4.
2 + 0 =
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5.
10 + 1 =
|
6.
1 + 17 =
|
|
7.
8 + 0 =
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8.
11 + 1 =
|
9.
2 + 7 =
|
|
10.
1 + 10 =
|
11.
9 + 5 =
|
12.
4 + 3 =
|
|
13.
6 + 14 =
|
14.
5 + 13 =
|
15.
4 + 13 =
|
|
16.
15 + 3 =
|
17.
16 + 1 =
|
18.
11 + 3 =
|
|
19.
5 + 10 =
|
20.
7 + 4 =
|
21.
5 + 7 =
|
|
22.
15 + 1 =
|
23.
10 + 5 =
|
24.
17 + 0 =
|
|
25.
14 + 5 =
|
26.
8 + 5 =
|
27.
9 + 6 =
|
|
28.
19 + 1 =
|
29.
13 + 5 =
|
30.
11 + 1 =
|
|
31.
14 + 3 =
|
32.
19 + 0 =
|
33.
14 + 6 =
|