666

Usage: {{User:Saintrain/A/NegTest|SomeNumericString}}.

This template attempts to evaluate the numeric string.

So: {{NegTest|100 -1}} (using a hyphen) returns 99;
{{NegTest|100 −2}} (using a markup minus) returns 98;
{{NegTest|100 −3}} (using a literal minus) returns 97.