by Pilar Bori Vivas · Salvatella · tapa blanda · ISBN 9788472108080
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«Daina R-3» is the subtraction exercise book by Pilar Bori Vivas, published by Salvatella in paperback (20 pages, in Catalan).
Activity book that develops the skill of subtracting with agility, with an ordered progression of difficulty. The exercises combine mechanical practice of the operation with reflection on the statements, so that the student applies the correct notion, in the context of a series that also covers addition, multiplication and division.
It is number 3 of the «Daina, restar» collection. It was published in 1985 as a first edition.
Aimed at children in the early years of primary school who are learning to subtract, as school reinforcement material.
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