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GMCA
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About GMCA
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Standings Season 3
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Register for the Next Season
League Manual
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Special Tasks
Multiplication & Division
Estimation, Multioperation & Fractions
League App with FAQs
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Aaryan Shukla
Jeonghee Lee
Kaloyan Geshev
Mishti Shah
Samuel Engel
Wenzel Grüß
Arthur Benjamin
Marc Jornet Sanz
Rahul Robin
Panelists
Japanese Soroban
Soroban Rating Simulator
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Robert Fountain 2/24/26 Robert Fountain 2/24/26

The Skiver Method of Division

Robert Fountain writes on the “Skiver Method” to rapidly approximate divisions.

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Sam Engel 12/31/25 Sam Engel 12/31/25

Basic Multioperation Examples

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Sam Engel 12/31/25 Sam Engel 12/31/25

Fractions

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