accountant

accounting

addition

apparatus

appliance

banking

banknote

billing

bills

business

calculate

calculating

calculation

calculator

calculus

clicking

college

compute

count

counter

data

decimal

engineering

financial

finane

fractions

homework

infesting

investments

investor

loans

looped

machine

male

man

math

modern

old

paying

planning

pressing

retirement

retro

ruler

sliderule

technology

ussr

vintage

workstation