calculator
/kæl.kjə.leɪ.təɹ/noun
A mechanical or electronic device that performs mathematical calculations; sometimes, an electronic one specifically.
Related words
compassA magnetic or electronic device used to determine the cardinal directions (usually magnetic or true north).highlighterA marker pen used to highlight text.protractorA circular or semicircular tool for drawing or measuring angles.rulerA person who rules or governs; someone or something that exercises dominion or controlling power over others.backpackTo hike and camp overnight in backcountry with one's gear carried in a backpack.eraserAn object used to erase or remove something written or drawn by a pen or a pencil.