GLOBAL MENTAL CALCULATORS ASSOCIATION

GMCA presents Calculation League — the world’s premier mental calculation competition.

Explore the powerful mind sport of mental calculation through our guides, simulators, and competition.

Skilled competitors may click Join or email contact@mentalcalculation.org to participate.

GMCAのYouTubeページはこちらで、試合、情報提供ビデオ、インタビュー、デモンストレーション、ショートクリップなど、さまざまな種類の動画を公開しています。

A glimpse into the world of Japanese soroban is available here. GMCA also offers a Japanese soroban rating test simulator here.

Practice simulators are available here and the competition app is available here.

If you are looking for instructional material, check the GMCA Guides section (above). Material added periodically.

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