+was created by German mathematician Wei Demei in15th century. Adding a vertical line to the horizontal line indicates an increase. "-"was also created by Wei Demei. Subtracting a vertical bar from the plus sign indicates a decrease.
"X" was first used by American mathematician Audrey in18th century. It means another way to increase, so write the plus sign on the diagonal. ⊙ was created by Swiss Hannah in18th century. It means decomposition, separating two points with a horizontal line. The number "=" was invented by16th century British scholar Colder.
Extended data:
Multiplication is a simple operation of addition and division is a simple operation of subtraction.
Subtraction and addition are reciprocal operations, and division and multiplication are reciprocal operations.
Appendix+Appendix = Sum
Negative-negative = difference
One addend = and-the other addend.
Subtraction = minuend-difference
Subtraction = difference+subtraction
Factor × factor = product
One factor = product ÷ another factor
Dividend = quotient
Divider = Divider
Dividend = quotient × divisor
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