
History of Mental/Oral Proofs  Mental Mathematics ? by RobertFontaine » 8 July, 2015  17:45 
by RobertFontaine 11 July, 2015  16:06 

Wife has decided I am a wingnut by RobertFontaine » 4 July, 2015  06:01 
by RobertFontaine 5 July, 2015  21:11 

Mental Abacus by A.Shadow » 17 September, 2014  12:19 
by TheMemoriser. 30 June, 2015  19:54 

Test equation editor by RobertFontaine » 21 June, 2015  19:44 
by TheMemoriser. 29 June, 2015  07:16 

Annoying 9 by RobertFontaine » 16 June, 2015  10:03 
by Kinma 26 June, 2015  09:13 

Multiplication by 9 by RobertFontaine » 23 June, 2015  20:58 
by Nodas 25 June, 2015  06:44 

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 