Mental Calculation, Mathematics, and Puzzles


Topic Replies Activity
About the Mental Calculation, Mathematics, and Puzzles category 1 October 27, 2018
3 difficult questions of Mental Calculations World Championship 19 August 25, 2019
Systems for Calculating Calendar Dates 31 August 25, 2019
Soroban Finger Exercises 3 August 20, 2019
I dont understand George Parker Bidder's Logarithms 11 August 19, 2019
An obvious trick (combo) 2 digits with last 2 numbers adding to 10 1 August 19, 2019
Calculated 9472 × 3367 in 1min 47 sec 27 August 18, 2019
Hectoc Strategies 2 August 17, 2019
Help choosing a system for mental math 23 August 16, 2019
Who is the best mental calculator? 10 August 15, 2019
Duplex method for squaring numbers very quickly 13 August 15, 2019
Roots decimals 28 August 14, 2019
Learning Rate 5 August 14, 2019
On The Nature Of Numbers 42 August 10, 2019
How to calculate antilogarithms in a easy way 20 August 9, 2019
Multiplication with parabolas 2 August 9, 2019
Think! There is always an easier way 27 August 8, 2019
Soroban resource 1 August 8, 2019
How to calculate antilogarithm mentally 4 February 14, 2019
How to Prove integers with sum of 10 trick? Stuck on something obvious 35 August 5, 2019
Complex Factors? 7 August 5, 2019
And now for something truly trivial 10 August 5, 2019
A Generating Function for all the Square numbers 1 August 3, 2019
Any of you math geeks have a favourite tex template for keeping your stuff? 1 July 30, 2019
A very small thought 19 July 29, 2019
Having a little fun with the basics tonight 26 July 27, 2019
Mental math 14 July 27, 2019
Playing with Numbers.. A few different ways of looking at the same thing 2 July 26, 2019
Patterns in the last two digits of Squares... Dimensions and Geometry 7 July 17, 2019
Looking for a Mental Math Training App 7 July 17, 2019