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GMCA
GMCA
About
Mental Calculation League
About the League
Standings Season 2
Schedule
Statistics
Register for the Next Season
League Manual
Japanese Soroban
Japanese Soroban
Soroban Rating Simulator
GMCA Simulators
League App with FAQs
Resources
Calculation Organizations and Events
Calculation Guides and Tutorials
Academic Literature
Performances and Media
Simulators
Board Members
Aaryan Shukla
Jeonghee Lee
Kaloyan Geshev
Mishti Shah
Samuel Engel
Wenzel Grüß
Advisory Panel
Arthur Benjamin
Marc Jornet Sanz
Panelists
Videos
Contact/Join
Discord (Chat)
English
Register
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Folder: Mental Calculation League
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About the League
Standings Season 2
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Statistics
Register for the Next Season
League Manual
Folder: Japanese Soroban
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Japanese Soroban
Soroban Rating Simulator
GMCA Simulators
League App with FAQs
Folder: Resources
Back
Calculation Organizations and Events
Calculation Guides and Tutorials
Academic Literature
Performances and Media
Simulators
Folder: Board Members
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Aaryan Shukla
Jeonghee Lee
Kaloyan Geshev
Mishti Shah
Samuel Engel
Wenzel Grüß
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Marc Jornet Sanz
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  • Instructional Videos,
• 4/23/25

Alternative Strategies for Rapid Mental Multiplications (with Mental Calculator Sam Engel)

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Traditional vs. Cross Multiplication (with Mental Calculator Sam Engel)

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How to Do Rapid Mental Multiplications using Cross-Multiplication (with Mental Calculator Sam Engel)

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