Editing Number (section)

===Rational numbers===
{{Main|Rational number}}
A rational number is a number that can be expressed as a fraction with an integer numerator and a positive integer denominator. Negative denominators are allowed, but are commonly avoided, as every rational number is equal to a fraction with positive denominator. Fractions are written as two integers, the numerator and the denominator, with a dividing bar between them. The fraction {{sfrac|''m''|''n''}} represents ''m'' parts of a whole divided into ''n'' equal parts. Two different fractions may correspond to the same rational number; for example {{sfrac|1|2}} and {{sfrac|2|4}} are equal, that is:
:<math>{1 \over 2} = {2 \over 4}.</math>

In general,
:<math>{a \over b} = {c \over d}</math> if and only if <math>{a \times d} = {c \times b}.</math>

If the [[absolute value]] of ''m'' is greater than ''n'' (supposed to be positive), then the absolute value of the fraction is greater than&nbsp;1. Fractions can be greater than, less than, or equal to&nbsp;1 and can also be positive, negative, or&nbsp;0. The set of all rational numbers includes the integers since every integer can be written as a fraction with denominator&nbsp;1. For example&nbsp;−7 can be written&nbsp;{{sfrac|−7|1}}. The symbol for the rational numbers is '''Q''' (for ''[[quotient]]''), also written [[Blackboard bold|<math>\mathbb{Q}</math>.]]