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Example: Comparing Decimals

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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")

Columnar addition:
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.





The above explanation is copied from Wikipedia, the free encyclopedia and is remixed as allowed under the Creative Commons Attribution- ShareAlike 3.0 Unported License.