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Math Symbols
The Most Valuable and Important
Miscellaneous Symbols
. . .
Shown and Explained

"Plus-Minus Sign"




Background - why plus-minus signs are used. . .

Symbols are a concise way of giving lengthy instructions related to numbers and logic.

Math Symbols are an invention, not a discovery. They are a communication tool. Symbols are used to eliminate the need to write long, plain language instructions to describe calculations and other processes. 




The most valuable, most frequently used Symbols in mathematics . . .

          The most important, most frequently used Miscellaneous Symbols 
          are listed below.
To See All Symbols To See All Symbols To See All Symbols To See All Symbols click here
Math - Plus-Minus Math Symbol for "Plus-Minus" -
The Math - Plus-Minus symbol             symbol means that the number (to the right of the symbol) is two numbers: a positive number AND a negative number. For Example, Math - Plus-Minus symbol                8 stands for two numbers: +8 and -8
The Math - Plus-Minus symbol symbol is commonly used: (1) In mathematical expressions and equations. (2) To quantify the margin or error (precision) of a computation or measurement.
Example 1: Math - Plus-Minus symbol , use in Mathematical Expressions and Equations Square Root: Square Root The use of the plus-minus symbol is a short hand way of showing that the square root of 256 has two answers: Square Root Absolute Value: Absolute Value This absolute value equation can be rewritten using the plus-minus symbol: Absolute Value The use of the plus-minus symbol clearly shows that two equations must be solved to determine the values of x which satisfy the original equation. These equations are: Absolute Value
Quadratic Equation: Quadratic Equation The use of the plus-minus symbol shows that two equations must be solved to determine which values of x satisfy the quadratic equation. These equations are: (1) Using the "plus" sign: Quadratic Equation (2) Using the "minus" sign: Quadratic Equation
Example 2: Math - Plus-Minus symbol , used to show "Precision" or "Margin or Error" Margin of Error: A local poll taken May 1-4 of 1200 registered voters showed Candidate A would beat Candidate B if the election were held now, 60 to 30 percent, with seven percent undecided. This poll has a margin of error of plus or minus four percentage points.

Candidate A should receive between 56% and 64% of the vote if the election were held today.

This could be written:

Candidate A
Likely Vote Margin of Error
Engineering Tolerance: A round pin is being manufactured to fit into a round hole, which is 20 mm in diameter. The round pin might have a manufacturing specification of 19.95 mm to 19.99 mm in diameter.

Using the plus-minus sign, this could be written:

Diameter of
Round Pin Engineering Tolerance




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