by Ana Alonso · ANAYA INFANTIL Y JUVENIL · tapa blanda · ISBN 9788466795050
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«El palacio subterráneo» is the children's novel by Ana Alonso, published by Anaya Infantil y Juvenil in hardback (96 pages, in Spanish).
The dragon Minus and the elf Berk follow a hidden passage to an enchanted palace, where they must decipher mysterious symbols to escape alive. The adventure is combined with activities that introduce Roman numerals and review comparisons, number decomposition, and subtraction with carrying.
It belongs to the Pizca de Sal collection, number 13, and includes illustrations by Maria Espluga Solé. Recommended reading from age 8.
Designed for primary school readers who are starting with Roman numerals and wish to consolidate basic operations, at home or in the classroom.
