Learn That Word

Papers and electronic calculators are common tools for calculation.
Source: http://en.wiktionary.org/wiki/File:US_Navy_081029-N-4954I-002_Chief_Aircrew_Survival_Equipmentman_Rob_Ramsey_calculates_flight_times.jpg
Author: U.S. Navy photo by Mass Communication Specialist 3rd Class Bryan M. Ilyankoff