Calculo Mental

 $38+23$  

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 $12\times6$  

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 $18\times2-24$  

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 $\frac{3}{4}\ +\ \frac{4}{8}$ 

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 $convierte\ \frac{2}{5}\ a\ número\ decimal$  

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 $\frac{2}{3}\ \times\frac{3}{5}$  

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 $115.4-12.4$  

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 $8.75+0.25-3$  

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 $¿Cuanto\ es\ 9^2?$  

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 $0.5\ +\frac{2}{4}-\frac{1}{3}$  

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