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The plus or addition sign was invented by Michael Stiple in 1544
Invented by Blaise Pascal (1623-1662), it was called a Pascaline, a mechanical calculator that used connected gears to perform additions.
Addition and subtraction are prehistoric, they were used before man could write, even som animals addd and subtract (raven, crows, apes, etc.)
Subtraction is the opposite of addition.
addition and subtract in integers