They used the abacus
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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.
You have to use pi bc the circle full length is 3.14 but that is a regular term people use to multiple without a calculator
To be more of a convenience for people.
im not a genius but i think it would be the -er in easier or the -or in calculator
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