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(8)

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Manuel refere que é usada a decomposição do número 7 sugerida pela disposição das

latas na imagem. Embora não o refira explicitamente neste momento, Manuel parece

reforçar o valor que atribui a esta tarefa por proporcionar o uso da propriedade

distributiva da multiplicação em relação à adição e por sugerir o uso de produtos já

conhecidos para efetuarem os cálculos.

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(9)

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