subtracting in SQL Server -


i have table in sql server have scores competencies, have 1 score standard , 1 actual score. instance s25 actual score , c25 standard score. need find difference between 2 can see above , below standard , cannot figure out how subtract work. way tried 

select (s25) - (c25) 25_score

which did not work

if table starts number, bracket it, , might work. error get? 

select (s25)-(c25) [25_score] table_name


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