Multiple (mathematics)

Short description: Product with an integer

In mathematics, a multiple is the product of any quantity and an integer. In other words, for the quantities a and b, it can be said that b is a multiple of a if b = na for some integer n, which is called the multiplier. If a is not zero, this is equivalent to saying that $b/a$ is an integer.

When a and b are both integers, and b is a multiple of a, then a is called a divisor of b. One says also that a divides b. If a and b are not integers, mathematicians prefer generally to use integer multiple instead of multiple, for clarification. In fact, multiple is used for other kinds of product; for example, a polynomial p is a multiple of another polynomial q if there exists third polynomial r such that p = qr.

Examples

14, 49, −21 and 0 are multiples of 7, whereas 3 and −6 are not. This is because there are integers that 7 may be multiplied by to reach the values of 14, 49, 0 and −21, while there are no such integers for 3 and −6. Each of the products listed below, and in particular, the products for 3 and −6, is the only way that the relevant number can be written as a product of 7 and another real number:

$14=7\times 2;$

$49=7\times 7;$

$-21=7\times (-3);$

$0=7\times 0;$

$3=7\times (3/7),3/7$ is not an integer;

$-6=7\times (-6/7),-6/7$ is not an integer.

Properties

• 0 is a multiple of every number ($0=0\cdot b$).
• The product of any integer $n$ and any integer is a multiple of $n$. In particular, $n$, which is equal to $n\times 1$, is a multiple of $n$ (every integer is a multiple of itself), since 1 is an integer.
• If $a$ and $b$ are multiples of $x,$ then $a+b$ and $a-b$ are also multiples of $x$.

Submultiple

In some texts, "a is a submultiple of b" has the meaning of "a being a unit fraction of b" (a=1/b) or, equivalently, "b being an integer multiple n of a" (b=n a). This terminology is also used with units of measurement (for example by the BIPM and NIST), where a unit submultiple is obtained by prefixing the main unit, defined as the quotient of the main unit by an integer, mostly a power of 10³. For example, a millimetre is the 1000-fold submultiple of a metre. As another example, one inch may be considered as a 12-fold submultiple of a foot, or a 36-fold submultiple of a yard.

See also

• Unit fraction
• Ideal (ring theory)
• Decimal and SI prefix
• Multiplier (linguistics)