Pre-twentie

                                                                                                                                    Devices have been used to aid computation for many years, mostly using one-to-one correspondence with fingers . The earliest counting device was probably a variety of tally stick . Later record keeping aids throughout the Fertile Crescent bundled calculi (clay spheres, cones, etc. ) which represented numbers of items, probably livestock or grains, sealed in hollow unbaked clay containers. The use of counting rods is one case.