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For questions regarding the arithmetical operation of division. For question specifically concerning the use of fractions, please consider the (fractions) tag.

Division is the reversed operation of multiplication.

If division is defined within the context, then $a$ divided by $b$ is commonly, interchangeably denoted by any of the following expressions:

• $\dfrac ab$
• $a/b$
• $a\div b$
• $ab^{-1}$

If defined, $\dfrac ab$ should be the unique element such that: $$\frac ab\cdot b=b\cdot\frac ab=a.$$