Explanation:
3 + 2 = 5 with apples
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. 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
The plus sign
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
A column of numbers, with the last number in the column
underlined usually indicates that the numbers in the column are to be added,
with the sum written below the underlined number. (Our solved example in mathguru.com uses
this concept)
http://en.wikipedia.org/wiki/Addition
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.