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Example: Comparing Decimals

 Post to:   Explanation: 3 + 2 = 5,

Addition is a mathematical operation that represents combining collections of objects together into a larger collection. It is signified by the plus sign (+). For example, in the picture on the right, there are 3 + 2 apples-meaning three apples and two other apples-which is the same as five apples. Therefore, 3 + 2 = 5. (Our solved example in mathguru.com uses this concept)

Besides counting fruits, addition can also represent combining other physical and abstract quantities using different kinds of numbers: negative numbers, fractions, irrational numbers, vectors, decimals and more.

## Notation and terminology

Addition is written using the plus sign "+" between the terms; that is, in infix notation. The result is expressed with an equals sign. For example,

1 + 1 = 2 (verbally, "one plus one is equal to two")

2 + 2 = 4 (verbally, "two plus two is equal to four") 5 + 12 = 17

# Inequality (mathematics)

In mathematics, an inequality is a statement how the relative size or order of two objects or about whether they are the same or not

1.  The notation a < b means that a is less than b.

2.  The notation a > b means that a is greater than b. (Our solved example in mathguru.com uses this concept)

3.  The notation a ≠ b means that a is not equal to b, but does not say that one is greater than the other or even that they can be compared in size.

http://en.wikipedia.org/wiki/Comparison_(mathematics)