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Abaci
"a counting device that consist of a frame holding rods on which aspecific number of beads are free to move. Each rod designates given denomination, such as units, tens, hundreds, etc, in the decimal system, and each bead represents a digit or a specific number of digits". British Dictionary definitions for abacus
MECHANICAL CALCULATORS
"A mechanical calculator, o calculating machine, was a mechanical device used to perform automatically the basic operations of arithmetic". Wikipedia
SLIde rules
"a device for performing mathematical calculations, consisting essentially of a ruler having a sliding piece moving along it, both marked with graduated, usually logaritmic scales". British Dictionary definitions for slide rules
counters
"anything used in keeping account, as a disk of metal or wood, used in some games for marking a player's position or for keeping score". Dictionary.com
SLIDE ADDERS
"Slide adders are a flat mechanical hand-held mechanical calculator that is used principally for addition and subtraction and for the most part were pocket-sized." http://sliderulemuseum.com/Adders.htm
pocket calculators
"a small electronic device with a keyboard and a visual display uded for making mathematical calculations".
Oxford dictionaries
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Times Table Calculators
"Before calculators were cheap and plentiful, people would use mathematical tables -lists of numbers showing the results of calculation with varying arguments- to simplify and drastically speed up computation. Tables of logarithms and trigonometric functions were common in math and science textbooks". Wikipedia