The topic of this group is Mental Calculation.
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

Our group image "Calculator" by arbyreed is licensed under CC BY-NC-SA 2.0

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