abaci
abacus
accounting
addition
ancient
antique
arithmetical
asia
asian
background
bar
bead
business
calculation
calculator
chinese
compute
count
device
discrete
education
equipment
finance
hand
holding
instrument
math
mathematical
mathematics
number
numerical
object
obsolete
old
primitive
retro
rows
series
solve
subtraction
sums
tool
traditional
vintage
woman
wood
wooden
work