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