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Addition (usually signified by the plus symbol +) 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 picture shows a combination of three apples and two apples, making a total of five apples.

addition sign definition: 1. the symbol + , used between two numbers to show that they should be added together 2. the symbol…. Learn more.

en.wikipedia.org/wiki/Plus_and_minus_signs

The minus sign, −, has three main uses in mathematics: The subtraction operator: a binary operator to indicate the operation of subtraction, as in 5 − 3 = 2. Subtraction is the inverse of addition. The function whose value for any real or complex argument is the additive inverse of that argument. For example, if x = 3, then −x = −3, but if x = −3, then −x = +3.

The symbol for iffinity is a capital O with an addition sign in it: [symmetry]. Castaway numbers One of the children said, "You could have said it was two-fourths."

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www.rapidtables.com/math/symbols/Plus_Sign.html

Plus Sign. The plus sign is written as a cross of horizontal and vertical lines: + The plus sign indicates addition operation of 2 numbers or expressions. For example: 3 + 4. means 3 plus 4, which is the addition of 3 and 4, which is equal to 7. The plus sign is located on the computer's keyboard near the backspace button.

simple.wikipedia.org/wiki/Sign_(mathematics)

In addition to the sign of a real number, the word sign is also used in various related ways throughout mathematics and the sciences: In graph theory, a signed graph is a graph in which each edge has been marked with a positive or negative sign.; In physics, any electric charge comes with a sign, either positive or negative. By general rules, a positive charge is a charge with the same sign as ...