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RE: RE: Strategy for mentally adding and subtracting numbers close to the ten // Estrategia para para sumar y restar mentalmente números próximos a la decena

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RE: Strategy for mentally adding and subtracting numbers close to the ten // Estrategia para para sumar y restar mentalmente números próximos a la decena

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emimoron(67)

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5y

One of the most difficult things is teaching children to develop their math skills and especially to do math without using a calculator. You have made a very good explanation in this post. Congratulations

ecency

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emimoron

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