numerical calculations arithmetic
aria-hidden="true" class="mwe-math-fallback-image-inline" src="https://wikimedia.org/api/rest_v1/media/math/render/svg/dfe972c32bdfc7274838beb71596b2001c2bd6af" style="vertical-align: -0.838ex; width:4.264ex; height:2.843ex;"/> Number theory was once called arithmetic, but nowadays this term is mostly used for numerical calculations.