Close-up of an old abacus on a grey background
Palabras clave
abacus,
account,
accountant,
summing,
addition,
black,
calculate,
calculation,
classroom,
closeup,
coloured,
count,
education,
factor,
sharpened,
green,
grey,
isolated,
mathematic,
mathematic,
number,
numeric,
childcare center,
old,
red,
representation,
school,
subtract,
subtraction,
sum,
tool,
white,
wood
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