1) It figures 2) Mechanical calculator 3) Obsolete sort of calculator 
[musical] Adding Machine is a musical adaptation of Elmer Rice`s 1923 play The Adding Machine, with music by Joshua Schmidt, and book and lyrics by Jason Loewith and Joshua Schmidt. The show opened in 2007 in Illinois before moving Off-Broadway in 2008. The show was nominated for (and later won) numerous Lucille Lortel Awards and Drama Desk... An adding machine was a class of mechanical calculator, usually specialized for bookkeeping calculations. In the United States, the earliest adding machines were usually built to read in dollars and cents. Adding machines were ubiquitous office equipment until they were phased out in favor of calculators in the 1970s and by personal computers begi...
a type of calculator (q.v.) used for performing simple arithmetical operations.
[n] - a calculator that performs simple arithmetic functions
totalizer noun a calculator that performs simple arithmetic functions
a machine capable of adding numbers and sometimes capable of performing the other arithmetic functions of subtraction, multiplication, and division: such machines are now obsolescent, having been replaced in most applications by electronic calculators.