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TorstenBerg's picture
About me: 

Biologist and oceanographer, got interested in mental math by a fascinating story about Wim Klein and by learning the chinese (and later the japanese) abacus.




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Member for
6 months 13 hours

Latest Posts and Comments

Title Type Comments Updated
More division tricks. Numbers ending in 1 or 2 Forum topic 4 4 months 1 week ago
Paper on calendar calculations – determine the year’s share for the day-of-week Forum topic 1 5 months 1 day ago
Chinese short division Forum topic 8 5 months 1 week ago
Soroban and flash anzan Forum topic 7 5 months 3 weeks ago
New member, 49 y, from Germany Forum topic 3 6 months 1 hour ago
Help choosing a system for mental math Forum topic 21 4 months 3 weeks ago
Markdown. Forum topic 6 5 months 3 weeks ago
Mental Calculation - Division - Resources? Forum topic 26 4 months 1 week ago
Memorizing the Periodic Table for time Forum topic 8 5 months 3 weeks ago