What kinds of calculators were used before electronics?

Answer 1

they used people fudging each other and how many times they would hump each other before getting tired...by El ReY A slide rule was commonly used in schools and industry. Chinese also had a basic slide beans up or down to compute

Answer 2

Well, in greek times, grecian scholars used the Abacus which used beads to keep track of numbers. Other societies used number charts similar to multiplication tables.

Answer 3

Abacus

Slide rule, Log Tables, Paper and pencil, Ready reckoners.