The usual way to form the plurals of numerals is to add an s:
- the 1960s
- five 55s
- The bonds are 4½s.
- Korolev scored 9.85s on the floor and pommel horse exercises.
In cases where this might cause misreading, add an apostrophe and s, or italicize the numerals:
- Her performance earned her three 5.8’s.
- His 5’s look like 6’s.
- His 5s look like 6s.
Whichever practice you adopt, use it consistently in any one document.
Do not pluralize SI/metric symbols:
- 5 kg (not 5 kgs)
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