
Remembering Logs... by RobertFontaine » 18 June, 2015  12:31 
by RobertFontaine 23 June, 2015  18:30 

Another handy fact in squares by RobertFontaine » 22 June, 2015  12:18 
by Nodas 23 June, 2015  07:30 

Triangles, Squares and Cubes more relationships by RobertFontaine » 22 June, 2015  19:08 
by Kinma 22 June, 2015  21:58 

Using calculus to multiply integers by RobertFontaine » 22 June, 2015  13:38 
by RobertFontaine 22 June, 2015  13:38 

Mental Calculation as a Visual Construct by RobertFontaine » 17 June, 2015  11:40 
by Kinma 18 June, 2015  01:30 

A nice paper on Napier and Logarithms. by RobertFontaine » 16 June, 2015  14:36 
by Kinma 17 June, 2015  10:47 

Nichomacus' Theorem  sum of cubes equal the sum squared. by RobertFontaine » 16 June, 2015  11:55 
by RobertFontaine 16 June, 2015  12:20 

Multiplication tables  expanding to 20X20 by Kinma » 15 June, 2015  15:29 
by Kinma 16 June, 2015  02:37 

O... I.. C.. Doh... Another obvious epiphany by RobertFontaine » 15 June, 2015  11:42 
by Kinma 16 June, 2015  02:19 

Squaring 3 digital number... More fun with squares by RobertFontaine » 11 June, 2015  20:18 
by RobertFontaine 14 June, 2015  15:27 

Patterns in the last two digits of Squares... Dimensions and Geometry by RobertFontaine » 12 June, 2015  12:19 
by Kinma 14 June, 2015  14:20 

How to divide with decimals using a soroban? by ArsDenisov » 12 June, 2015  13:24 
by Kinma 14 June, 2015  13:46 

Good old article on mentally calculation of exponents by RobertFontaine » 12 June, 2015  18:56 
by Kinma 14 June, 2015  13:33 

How to retain what you need to calculate? by ArsDenisov » 13 June, 2015  04:24 
by Kinma 14 June, 2015  12:03 

Mental Training by RobertFontaine » 13 June, 2015  12:25 
by RobertFontaine 14 June, 2015  11:18 

Cross multiplication and powers by ArsDenisov » 14 June, 2015  05:26 
by RobertFontaine 14 June, 2015  10:07 

Trick for squaring 2 digit numbers above 50 by Kinma » 23 November, 2013  23:34 
by Kinma 12 June, 2015  06:47 

Fun with squares... The next square.. by RobertFontaine » 9 June, 2015  20:16 
by RobertFontaine 11 June, 2015  18:19 

New to 3x2 Calculation  interesting effect by RobertFontaine » 6 June, 2015  09:08 
by Nodas 9 June, 2015  22:38 

Soroban method: How to retain the numbers you're multiplying? by ArsDenisov » 9 June, 2015  11:59 
by Kinma 9 June, 2015  13:54 

Practicing on Purpose by RobertFontaine » 3 June, 2015  14:49 
by Kinma 9 June, 2015  11:17 

Analyzing Rüdiger Gamms performance (division by 167) by Kinma » 26 January, 2013  03:38 
by Kinma 8 June, 2015  02:13 

Dualnback as an adjunct to mental? by RobertFontaine » 5 June, 2015  13:23 
by Nodas 6 June, 2015  18:19 

Improving Mental Calculation Skill by RobertFontaine » 17 May, 2015  12:51 
by Nodas 4 June, 2015  00:16 

Difference of squares  even faster multiplication by Kinma » 12 June, 2014  02:54 
by RobertFontaine 2 June, 2015  08:09 