Librería Samer Atenea
Librería Aciertas (Toledo)
Kálamo Books
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Librería Kolima (Madrid)
Librería Proteo (Málaga)
This is an intriguing and original puzzle book where unknown numbers have to be identified by a series of cryptic clues. Logical thinking and systematic detective work is required and these puzzles offer a fine way to reinforce the meaning of mathematical words and to investigate and appreciate the ever fascinating properties of numbers. 3