by Ramón Rubio Silvestre · Editorial Rubio · tapa blanda · ISBN 9788485109555
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«Operaciones Rubio 3A» is the arithmetic exercise book by Ramón Rubio Silvestre, published by Editorial Rubio in paperback (20 pages, in Spanish).
The Rubio 3A operations book works on multi-digit multiplication with graded exercises: multiplying by 10 and 100, solving multi-digit multiplication problems, and writing numbers in figures. It also presents problems with simple situations, such as calculating the weight of two flamingos.
It belongs to the Rubio Operations and Problems collection (volume 3A). The book has A5 format.
For elementary school students aged 8 to 9 who are reinforcing multi-digit multiplication.
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