by Ramón Rubio Silvestre · Editorial Rubio · tapa blanda · ISBN 9788416744688
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«Problemes RUBIO 19 (valencià)» is the maths problem workbook by Ramón Rubio Silvestre (Editorial Rubio, paperback, 20 pages, in Valencian).
The workbook presents addition, subtraction, multiplication and division problems with multi-digit numbers, set in familiar situations such as a 100-metre runner's progress, to practise logical-mathematical reasoning.
Number 19 in the «Operacions i Problemes RUBIO (valencià)» collection. Published in 2018, it is an A5-format workbook.
Recommended for primary school students aged 11 to 12, as maths reinforcement material in Valencian.
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