Definition:Prosthaphaeresis

Definition
Prosthapheiresis is the process whereby multiplication and division are performed by:
 * $(1): \quad$ converting the numbers into a form where they can be added or subtracted
 * $(2): \quad$ performing the addition or subtraction
 * $(3): \quad$ converting the result back again, using the inverse process to step $(1)$.

Linguistic Note
The word prosthapheiresis is a neologism coined some time in the 16th century from the two Greek words:
 * prosthesis, meaning addition
 * apheiresis, meaning subtraction.

With the advent of machines to aid the process of arithmetic, this word now has only historical significance.

, in his from 2008, accurately and somewhat diplomatically describes the word as "ungainly".