Dictionary
an arithmetic operation in which the difference between two numbers is calculated "the subtraction of three from four leaves one" "four minus three equals one" the act of subtracting (removing a part from the whole) "he complained about the subtraction of money from their paychecks"
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Wikipedia
In mathematics, subtraction is one of the four basic arithmetic operations. It is usually denoted by an minus sign in infix notation infix notation.The traditional names for the terms of the subtraction in the formulac'' − ''b'' = ''a''are minuend (''c'') − subtrahend (''b'') = difference (''a'').Subtraction is used to model the following three physical processes. First, from a given collection, take away (subtract) a given number of objects. Second, combine a given measurement with an opposite measurement. For example, combine a movement right followed by a movement left, or combine a deposit and a withdrawal. Third, compare two objects to find their ''difference''. For example, to find the difference between $800 and $600, subtract $800 − $600 = $200.Mathematically, it is often useful to view subtraction as a kind of addition, addition of the opposite. Thus, we can view 7 − 3 = 4 as the sum of seven and negative three. This allows and requires us to apply to subtraction all of the familiar rules and nomenclature of addition. Subtraction is not commutative (in fact, it is Anticommutativityanticommutative) or associative, but addition of signed numbers is. Professional mathematicians seldom used the words ''minuend'' and ''subtrahend'' but rather consider 7 − 3 = 4 to be the sum of two terms, seven and negative three.
Algorithms for subtraction - method of complements
External links - Printable Worksheets: kwiznet.com - One Digit Subtraction, kwiznet.com - Two Digit Subtraction, and kwiznet.com - Four Digit Subtractioncut-the-knot.org - Subtraction Game webhome.idirect.com - Subtraction on a Japanese abacus selected from webhome.idirect.com - Abacus: Mystery of the Bead
See also - Elementary arithmeticDecrementNegative and non-negative !numbersCategory:Arithmeticbr:L amadurda:Subtraktionde:Subtrak tionfr:Soustractionko:뺄셈is :Frádrátturit:Sottrazionela: Subtractionl:Aftrekkenja:減 pl:Odejmowaniept:Subtraçãos imple:Subtractionsv:Subtraktio ntl:Pagbabawasth:การล zh:減法
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