Adverb
Conformably to the principles or methods of arithmetic.
Source: Webster's dictionaryAnyone who understands algebraic notation, reads at a glance in an equation results reached arithmetically only with great labour and pains. Antoine Augustin Cournot
this problem is arithmetically easy Source: Internet
It is arithmetically possible for one worker to generate spousal benefits for up to five of his/her spouses that he/she may have, each must be in succession after a proper divorce for each after a marriage that lasted at least ten years each. Source: Internet
The Chaldeans took account of this arithmetically, and used a table giving the daily motion of the Moon according to the date within a long period. Source: Internet
Zemeckis and Gale said that they had set the story in 1955 because a 17-year-old traveling to meet his parents at the same age arithmetically required the script to travel to that decade. Source: Internet