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its called a calculator :/
If you mean electronically, then it would still be called a calculator. But, before that, people used the abacus, which had lots of sliding thingies and such.
i am used to count some call this a manual calculator it's also called abacus
The Chinese invention that was the first calculator was called an abacus. It was invented sometime between 2700 and 2300 BC.
Theres something called a calculator. Get one