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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
4 weeks 22 hours

Latest Posts and Comments

Title Type Comments Updated
Paper on calendar calculations – determine the year’s share for the day-of-week Forum topic 0 1 day 21 hours ago
Chinese short division Forum topic 8 1 week 1 day ago
Soroban and flash anzan Forum topic 7 3 weeks 1 day ago
New member, 49 y, from Germany Forum topic 3 4 weeks 10 hours ago
Help choosing a system for mental math Forum topic 17 14 hours 35 min ago
Markdown. Forum topic 6 3 weeks 1 day ago
Mental Calculation - Division - Resources? Forum topic 25 3 weeks 6 days ago
Memorizing the Periodic Table for time Forum topic 8 3 weeks 5 days ago