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)
- 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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