Example:
Anne and her brother used a calculator to find out how much money they would need for gas on their roadtrip by calculating how far they would have to drive to get from Alaska to Ushuaia. 
The Noun Project
Photo license:
CC: Attribution, Commercial Use
Regionalism:
Neutral
Regional variant:
Neutral
Full Expression:
Scientific Instruments: calculator
This device is used to complete both simple and complex mathematical operations with numbers.