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greymatters's picture
About me: 

I'm interested in all types of mental improvement, primarily memory techniques and mental math. I have written my own course on basic memory techniques, as well as a book on my own technique for calculating the day for any date. I am also the blogger behind the Grey Matters blog, focusing on techniques for mental improvement.


United States


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Member for
5 years 10 months

Latest Posts and Comments

Title Type Comments Updated
More repetition fun in division Forum topic 2 17 hours 31 min ago
Which Is Easier to Calculate? Km to Miles or Vice Versa? Forum topic 2 2 weeks 3 days ago
What is 6÷2(1+2)? Forum topic 7 7 months 2 weeks ago
Mattias Ribbing Forum topic 2 8 months 1 week ago
Other avenues of attack? Forum topic 30 1 year 2 months ago
How to do divisions to many decimal places mentally? Forum topic 11 2 years 8 months ago
Prime factor mnemonics Forum topic 5 2 years 4 months ago
Calculating 10 ^ 0.1 , 0.2, 0.3, etc Forum topic 5 2 years 9 months ago
Avoiding the carry Forum topic 4 1 month 1 week ago
Memory feat presentation Forum topic 3 8 months 1 week ago
Lattice Multiplication and Drawing Lines Forum topic 5 3 years 2 months ago
Mental Math Resources Forum topic 0 3 years 4 months ago
Famous Mental Calculators Forum topic 3 3 years 4 months ago
Speed calculators: What is really useful to memorize? Forum topic 32 3 years 3 months ago
Systems for Calculating Calendar Dates Forum topic 26 2 months 2 weeks ago
Discussion of the limitations of mental calculation techniques (and hopefully innovative solutions) Forum topic 14 1 year 11 months ago
Using MOL and Number Mnemonics to learn multiplication tables Forum topic 8 3 years 5 months ago
Trick for squaring 2 digit numbers above 50 Forum topic 7 2 years 2 months ago
New Approach To Calculating Year Keys Forum topic 1 3 years 8 months ago
Let's Make a Deal Forum topic 3 3 years 8 months ago