Видео с ютуба Problems In Abacus

Abacus Mental Math Demonstration - Strengthen Math Facts, Improve Focus, Concentration & Memory

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Осваивайте двух- и трехзначные суммы на абакусе: продвинутые методы стали проще!

Освоение абакуса: объяснение простых задач

How to use the abacus, Add, Subtract, Multiply, Divide /GTflix

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How to pinch the abacus in 5 seconds!

Сложение и вычитание с использованием Big Friends на Abacus | InstAbacus

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Amazing Abacus Math Video

Abacus Tutorials | Lesson - Formula In Big Friend | Abacus Classes

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Animated Abacus Level 1

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