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Example:Find Missing Digits in Adding Two Numbers using Reasoning.

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Explanation:

 

 

Addition

 

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.