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* Dimensionless ratios (i.e. those not incorporating units) are given using numerals and a colon, or numbers-as-words and ''to'': {{xt|favored by a 3:1 ratio}} or {{xt|a three-to-one ratio}}, but not {{!xt|a 3/1 ratio}} or {{!xt|a 3–1 ratio}}. Use a "spaced" colon when a decimal point is present ({{xt|a 3.5 : 1 ratio}}{{snd}}markup: <code>a 3.5&nbsp;:&nbsp;1 ratio</code>). Do not use the colon form where units are involved ({{!xt|dissolve using a 3 ml:1 g ratio}})—instead see ''ratios'' section of table at [[#Unit names and symbols|§ Unit names and symbols]], below.'' | * Dimensionless ratios (i.e. those not incorporating units) are given using numerals and a colon, or numbers-as-words and ''to'': {{xt|favored by a 3:1 ratio}} or {{xt|a three-to-one ratio}}, but not {{!xt|a 3/1 ratio}} or {{!xt|a 3–1 ratio}}. Use a "spaced" colon when a decimal point is present ({{xt|a 3.5 : 1 ratio}}{{snd}}markup: <code>a 3.5&nbsp;:&nbsp;1 ratio</code>). Do not use the colon form where units are involved ({{!xt|dissolve using a 3 ml:1 g ratio}})—instead see ''ratios'' section of table at [[#Unit names and symbols|§ Unit names and symbols]], below.'' | ||
=== | ===Decimals=== | ||
* A period/full point (<code>.</code>), {{em|never}} a comma, is used as the decimal point ({{xt|6.57}}, not {{!xt|6,57}}). | * A period/full point (<code>.</code>), {{em|never}} a comma, is used as the decimal point ({{xt|6.57}}, not {{!xt|6,57}}). | ||
* Numbers between −1 and +1 require a leading zero ({{xt|0.02}}, not {{!xt|.02}}); exceptions are sporting performance averages ({{xt|.430 [[batting average]]}}) and commonly used terms such as {{xt|.22{{nbsp}}caliber}}. | * Numbers between −1 and +1 require a leading zero ({{xt|0.02}}, not {{!xt|.02}}); exceptions are sporting performance averages ({{xt|.430 [[Wikipedia:Batting average|batting average]]}}) and commonly used terms such as {{xt|.22{{nbsp}}caliber}}. | ||
* Indicate repeating digits with an [[Vinculum (symbol)|overbar]] e.g. | * Indicate repeating digits with an [[Wikipedia:Vinculum (symbol)|overbar]] e.g. <code><nowiki>14.31{{overline|28}}</nowiki></code>}} gives {{xt|14.31{{overline|28}}}}. (Consider explaining this notation on first use.) Do not write e.g. {{nobr|{{!xt|14.31(28)}}}} because it resembles notations for {{section link||Uncertainty}}. | ||
====<span id="Delimiting (grouping of digits)"></span>Grouping of digits==== | ====<span id="Delimiting (grouping of digits)"></span>Grouping of digits==== | ||
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