A smartphone screen shows a calculator app with number keys and basic arithmetic function buttons.
Schlüsselwörter
smartphone,
display,
calculating machine,
app,
number,
screen,
digital,
buttons,
arithmetic,
mathematic,
technology,
computer keyboard,
worked,
device,
mobile,
icon,
interface,
tool,
contraption,
calculation,
zero,
clear,
operation,
electronic
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