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.

大曼彻斯特联合管理局 YouTube页面此处提供各类视频：比赛实况、资讯视频、专访、示范教学及精彩片段。

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.

第四季现已开放报名