Colorful abacus with wooden frame for mathematical calculations.
Schlüsselwörter
abacus,
mathematic,
mathematic,
calculation,
counting,
bead,
wooden,
frame,
colourful,
education,
learning,
arithmetic,
tool,
device,
school,
number,
compute,
calculate,
instructing,
educational,
vintage,
retro,
antique,
old,
classic,
traditional,
ancient,
method,
system,
aid,
instrument,
equipment,
red,
black,
blue,
green,
yellow,
orange,
brown,
numerical,
numeric,
mathematical,
numbering,
enumeration,
reckoning,
figuring,
summing
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