Cute little boy in yellow t-shirt and glasses with abacus

Schoolboy with abacus. Young kid training mental arithmetic - complex process that includes number management, manipulation of information and knowledge of mathematical concepts

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圖片庫的Schoolboy with abacus. Young kid training mental arithmetic - complex process that includes number management, manipulation of information and knowledge of mathematical concepts 圖片 Image 152221191.

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Schoolboy with abacus. Young kid training mental arithmetic - complex process that includes number management, manipulation of information and knowledge of mathematical concepts

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