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