by Ramón Rubio Silvestre · Editorial Rubio · tapa blanda · ISBN 9788485109647
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«Problemas Rubio 9» is the math exercise book by Ramón Rubio Silvestre, published by Editorial Rubio in paperback (20 pages, in Spanish).
It presents everyday math problems, such as working out how many runners do not finish a marathon, to practice carrying in addition and subtraction. The exercises reinforce logical-mathematical reasoning and calculation agility, with an approach designed for the primary education stage.
Book number 9 in the «Operaciones y Problemas RUBIO» collection, in its updated 2018 edition. Recommended for children aged 7 to 8.
For elementary school students who want to consolidate carrying in addition and subtraction, as school reinforcement or for working at home.
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