Mental Calculation, Mathematics, and Puzzles


Topic Replies Activity
Left to Right method for large numbers | Carrying problem 9 October 5, 2019
Avoiding the carry 8 October 2, 2019
Calculating Logarithms on a Soroban 2 October 2, 2019
Soroban Finger Exercises 4 October 1, 2019
Mental Abacus 10 September 30, 2019
Soroban #4 1 September 28, 2019
Reading Newton's Principia Mathematica by candlelight 1 September 28, 2019
Tips for competing in mental calculation competitions 1 September 27, 2019
Logarithms explained Bob Ross style 1 September 27, 2019
How large a subtotal (digits) do you maintain without mnemonics? 7 September 25, 2019
Do you want to learn soroban and flash anzan? Click here for classes online with record holder in memoriad: Jeonghe Lee! 14 September 24, 2019
Help choosing a system for mental math 31 September 20, 2019
Some questions about Soroban 3 September 18, 2019
Mathemagician course 10 September 17, 2019
Double digit squares... useful applications? 4 September 16, 2019
Mental math 15 September 14, 2019
Introduction to Higher Mathematics 3 September 14, 2019
Even easier mentally calculating logarithms 5 September 12, 2019
Sharpening the Axe 8 September 9, 2019
Dividing 52/59 6 September 9, 2019
Yaashwin Sarawanan, the new Scott Flansburg! 2 September 7, 2019
Noodling on Primes 2 September 2, 2019
Systems for Calculating Calendar Dates 47 September 1, 2019
Modular Arithmetic and Riemann surfaces 15 August 30, 2019
Hectoc Strategies 6 August 28, 2019
Creatively sneaking square roots into HECTOC 1 August 28, 2019
Any gifted mental calculators in stock trading? Do you use it in your career? 3 August 27, 2019
3 difficult questions of Mental Calculations World Championship 32 August 27, 2019
Calculate log43 and log85 mentally 4 August 26, 2019
I dont understand George Parker Bidder's Logarithms 11 August 19, 2019