FORT LEE — For 10 seconds, a series of 50 random three-digit numbers flashed on the screen. After another second, abacus master Jeonghee Lee announced she'd finished the mental addition, correctly ...
Junior UCMACS Abacus Mental Arithmetic Skills, a renowned institution in the field of abacus and mental arithmetic training for over two decades, has set an extraordinary benchmark in the world of ...
IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This illustrated paperback book gives ...
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