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