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# subtraction

Subtraction is a mathematical operation in which the value of a number is decreased by the values of one or more other numbers. Subtraction can be seen as a kind of addition with negative numbers. For example, $7-4=7+(-4)=3$.

The usual operator looks like a dash: $-$. This operator is used in standard infix notation as well as in Polish notation and reverse Polish notation.

Besides the possibility of overflow or underflow, subtraction presents no problems for fixed point arithmetic provided the operands are representable in fixed point to begin with.

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## Mathematics Subject Classification

00A06*no label found*00A05

*no label found*11B25

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## Comments

## Subtraction in numerals

The numerals in most languages utilize the multiplication and the addition in forming compound numerals, e.g.

"two hundred" = '2 times hundred',

"a thousand and five" = 'thousand plus 5'.

There are also languages using the subtraction in certain numerals.

For example the Finnish words for 8 (kahdeksan) and 9 (yhdeks\"an) have originally meant '10-2' and '10-1', viz. the numerals for 2 and 1 are "kaksi" (stem "kahde-", "kahte-") and "yksi" (stem "yhde-", "yhte-"). So "kahdeksan" has in ancient times meant literally 'there are missing two from ten' and "yhdeks\"an" analogically. The situation is similar in other Finnic languages, as in Mordvin and Mari.