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