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