Mental Calculation Discussion List

Every mental calculator is welcome to join our mailing list about mental calculation at

The topics discussed are for example:

  • advanced mental calculation tasks (like extracting roots or multiplying big numbers)
  • algorithms
  • books about mental calculating
  • competitions, achievements and records for mental calculations
  • teaching mental calculation at school
  • useful computer programs
  • using the abacus / soroban

Beginners' questions are welcome, but do not expect to get the solution for your homework here.

Books about Mental Calculation:

Calculating Without Instruments

How to Calculate Quickly

Calculating Without Instruments

Dead Reckoning : Calculating Without Instruments


World Records for Memory and Mental Calculation,
Back to the World Record Homepage