Simple Soroban (Abacus)

提供 Bruno Takahashi Carvalhas de Oliveira AppTrack Ninja。

Japanese abacus with tutorials

Simple Soroban is a complete Japanese abacus in your pocket. Whether you are discovering the soroban for the first time or training for serious mental calculation, everything is included and everything is free. It's multi-touch and configurable, so it feels like a real soroban. LEARN Step-by-step interactive tutorials teach you addition, subtraction, multiplication and division from scratch. No prior knowledge needed: you will learn how to read the beads, manipulate numbers, use complements, and carry across columns at your own pace. PRACTICE Freeform mode: a realistic soroban, for homework, …

カテゴリ: Education, Utilities

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