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Calculo mental
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9
18
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50
100
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100
200
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2
4
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40
80
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30
60
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Okay!
7
14
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25
50
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90
180
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33
66
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10
20
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21
42
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5
10
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4
8
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33
66
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Okay!
90
180
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Okay!
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