Addition
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Addition is one of the four basic operations of arithmetic, the other three being subtraction, multiplication and division. The addition of two whole numbers results in the total amount or sum of those values combined. The example in the adjacent image shows two columns of three apples and two apples each, totaling at five apples. This observation is equivalent to the mathematical expression "3 + 2 = 5".
Part of Charles Babbage's Difference Engine including the addition and carry mechanisms
A circular slide rule
Analog computer
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TR-10 desktop analog computer of the late 1960s and early 1970s
The Antikythera mechanism, dating between 150 and 100 BC, was an early analog computer.
Analog computing machine at the Lewis Flight Propulsion Laboratory c. 1949.