numbers using pen and paper without aids

Deciscale computing (10^-1)

* 1 × 10^-1: multiplication of two 10-digit numbers by a 1940s electromechanical desk calculator
* 3 × 10^-1: multiplication on Zuse Z3 and Z4, first programmable digital computers, 1941 and 1945 respectively
* 5 × 10^-1: computing power of the average human mental calculation

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