Mental Math Training

• Online mental math (multiplication, division, addition, subtraction) & N-back training, free

Mental Math Sites

One of the best places to learn about the art and science of mental math is the MentalCalculation mailing list.

There's an excellent collection of over 400 tips and tricks at BEATCALC: Beat the Calculator.

• Speed Arithmetic A collection of mental math techniques found in various books
• Memory and Mental Calculation World Records
• Mental Calculation World Cup
• "What's All This Mental Math Stuff, Anyhow?" article by Bob Pease 2006-03-30
• Wikipedia:Mental_calculation
• A scientific study on a calculating prodigy
• A study on brain areas used by a calculating prodigy. See for the freetext article (provided by Research Gate).
• Vedic math
• International competitions in mental calculation
• Advanced mental calculation techniques and psychology