They all mean roughly the same thing. e. 'less than').
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AbilAbout five hundred million dollars have been spent ...Another option is "some".
HuevosSome five hundred million dollars has been spent ... -> Note: Singular verb here."some * dollars has" 457 Google hits
AbilAbout five hundred million dollars have been spent ...Yankee has already answered about the meaning. How about the register? I see "Around" as the most colloquial one and "Approximately" and "An estimated" as more formal.
Around ..
Approximately ..
An estimated ..
Do the above mean the same thing?