Editing Encyclopedia:Manual of Style (section)

==Numbers<span id="Spelling out numbers"></span>==
{{Main|Wikipedia:Manual of Style/Dates and numbers#Numbers}}
*Integers from zero to nine are spelled out in words. Integers greater than nine {{em|expressible in one or two words}} may be expressed either in numerals or in words. Other numbers are given in numerals or in forms such as {{xt|21{{nbsp}}million}}. See {{section link|MOS:NUM|Numbers as figures or words}}.
*In general, in numbers with five or more digits to the left of the decimal point, use commas to group those digits. Numbers with four digits are at the editor's discretion: {{xt|12,345}}, but either {{xt|1,000}} or {{xt|1000}}. See {{section link|MOS:NUM|Grouping of digits}}.
*In general, use decimals rather than fractions for measurements, but fractions are sometimes used with [[imperial units|imperial]] and [[U.S. customary units|US customary]] units. Keep articles internally consistent.
*[[Scientific notation]] (e.g., {{xt|{{val|5.8|e=7|u=kg}}}}) is preferred in scientific contexts. Markup: <code><nowiki>{{val|5.8|e=7|u=kg}}</nowiki></code>.
*Write out "million" and "billion" on the first use. After that, unspaced "M" can be used for millions and "bn" for billions: {{xt|70M}} and {{xt|25bn}}. See {{section link|MOS:NUM|Numbers as figures or words}} for similar words.
*Write {{xt|3%}}, {{xt|three percent}}, or {{xt|three per cent}}, but not {{!xt|3{{nbsp}}%}} (with a space) or {{!xt|three{{nbsp}}%}}. "Percent" is American usage, and "per cent" is British usage {{crossref|pw=y|(see {{section link||National varieties of English}})}}. In ranges of percentages written with an en dash, write only a single percent sign: {{xt|3–14%}}.
*Indicate uncertainties as e.g., {{xt|{{val|1.534|0.35|e=23|u=m}}}}. Markup: <code><nowiki>{{val|1.534|0.35|e=23|u=m}}</nowiki></code>. See {{section link|MOS:NUM|Uncertainty and rounding}} for other formats.