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Abacus soroban pour apprendre l'arithmétique mentale pour les enfants. Concept d'illustration du système japonais de mathématiques mentales. Vecteur par ©Elena Pimukova 404951366
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Vecteur Stock Abacus for mental arithmetic. Concept of illustration of the Japanese system of mental math. Vector illustration | Adobe Stock
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Vecteur Stock European abacus counting frame. Calculating tool with rainbow colored beads sliding on wires. Used in pre- and in elementary schools as an aid in teaching the numeral system and arithmetic
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