Maak de som uit de tafel van 10 kloppend
Tafels
1.
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10
10
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2.
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10
4
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3.
×
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10
6
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10
4
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5.
×
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10
4
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6.
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10
3
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10
9
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×
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10
4
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9.
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10
3
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10.
×
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10
9
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11.
×
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10
10
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10
9
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×
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10
10
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×
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10
3
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10
2
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×
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10
9
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10
1
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10
10
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×
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10
5
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20.
×
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10
3
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21.
×
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10
9
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22.
×
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10
1
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23.
×
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10
2
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24.
×
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10
5
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