Editing English numerals (section)

==Ordinal numbers==
{{See also|Storey#Numbering|l1=Numbering of storeys in buildings}}
{{See also|Ordinal numeral|l1=Ordinal numeral}}
[[Ordinal number (linguistics)|Ordinal]] numbers refer to a position (also called index or rank) in a [[sequence]]. Common ordinals include:
{|class="wikitable"
|-
|0th||zeroth or (rarely) noughth ''(see below)''|| 10th||tenth||&nbsp;||&nbsp;
|-
|1st||first||11th||eleventh||&nbsp;||&nbsp;
|-
|2nd||second|||12th||twelfth||20th||twentieth
|-
|3rd||third||13th||thirteenth||30th||thirtieth
|-
|4th||fourth|||14th||fourteenth||40th||fortieth
|-
|5th||fifth||15th||fifteenth||50th||fiftieth
|-
|6th||sixth|||16th||sixteenth||60th||sixtieth
|-
|7th||seventh|||17th||seventeenth||70th||seventieth
|-
|8th||eighth|||18th||eighteenth||80th||eightieth
|-
|9th||ninth|||19th||nineteenth||90th||ninetieth
|}
''Zeroth'' only has a meaning when [[Zero-based numbering|counting starts with zero]], which happens in a [[mathematics|mathematical]] or [[computer science]] context. Ordinal numbers predate the [[0|invention of zero]] and [[positional notation]].

Ordinal numbers such as 21st, 33rd, etc., are formed by combining a ''cardinal'' ten with an ''ordinal'' unit.
{|class="wikitable"
|-
|21st||twenty-first
|-
|25th||twenty-fifth
|-
|32nd||thirty-second
|-
|58th||fifty-eighth
|-
|64th||sixty-fourth
|-
|79th||seventy-ninth
|-
|83rd||eighty-third
|-
|99th||ninety-ninth
|}
Higher ordinals are not often written in words, unless they are round numbers (thousandth, millionth, billionth). They are written with digits and letters as described below. Some rules should be borne in mind.
* The suffixes ''-th'', ''-st'', ''-nd'' and ''-rd'' are occasionally written [[superscript]] above the number itself.
* If the tens digit of a number is 1, then "th" is written after the number. For example: 13th, 19th, 112th, 9,311th.
* If the tens digit is ''not'' equal to 1, then the following table could be used:
{|class="wikitable"
|-
|If the units digit is:
|0||1||2||3||4–9
|-
|This is written after the number
|th||st||nd||rd||th
|}
*For example: 2nd, 7th, 20th, 23rd, 52nd, 135th, 301st.

These ordinal abbreviations are actually hybrid contractions of a numeral and a word. 1st is "1" + "st" from "fir'''st'''". Similarly, "nd" is used for "seco'''nd'''" and "rd" for "thi'''rd'''". In the legal field and in some older publications, the ordinal abbreviation for "second" and "third" is simply "d".
*For example: 42d, 33d, 23d.

NB: "D" still often denotes "second" and "third" in the numeric designations of units in the US armed forces, for example, 533d Squadron, and in legal citations for the second and third series of case reporters.