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Arithmetic --- Number concept --- Study and teaching (Elementary) --- Apperception --- Psychology --- Piaget, Jean, --- Ppiaje, --- Pʻei-ya-hsieh, --- Pʻi-ya-chieh, --- Piazhe, Zhan, --- Piaze, Zan, --- Pʻiaje, --- Piʼaz'eh, Z'an, --- Piaget, J. P. --- Pi-a-je, --- Piyajie, --- פיאז׳ה, ז׳אן --- פיאז׳ה, ז׳אן, --- Piyāzhah, Zhān, --- پياژه، ژان, --- Arithmetic - Study and teaching (Elementary) --- Number concept - Study and teaching (Elementary)