That doesn't make any sense, unless, as agentM suggest, your number field is represented internally as a string.
While you might have some unusual reason for doing so, it's not a good idea.
If possible, I'd put the burden of conversion on the database. Depending on what you're using, and how you're querying it, you might be able to use
SELECT INT(field) FROM table
-or-
SELECT CONVERT(NUMERIC (10,2),field) FROM table
good luck!
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