by Ramón Rubio Silvestre · Editorial Rubio · tapa blanda · ISBN 9788416744688
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«Problemes RUBIO 19 (valencià)» is the math 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-meter runner's progress, to practice logical-mathematical reasoning.
Number 19 in the «Operacions i Problemes RUBIO (valencià)» collection. Published in 2018, it is an A5-format workbook.
Recommended for elementary school students aged 11 to 12, as math reinforcement material in Valencian.
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