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Study
Cálculo mental
0
%
0
0
0
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Restart
12+8
20
Oops!
Okay!
231+30
261
Oops!
Okay!
14+6
20
Oops!
Okay!
23-9
14
Oops!
Okay!
3+8
11
Oops!
Okay!
140+50
190
Oops!
Okay!
100+20
120
Oops!
Okay!
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