division, especially by a one-digit divisor, in which the steps of the process are performed mentally and are not written down.
Origin of short division
First recorded in 1895–1900
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
the division of numbers, usually integers, that can be worked out mentally rather than on paper
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012