Sentence:  Gore has looked into buying cable channel News World International. Despite initial reports, Gore's camp says he and his backers intend to make the channel not a liberal mouthpiece but a "hip" news channel. ... Maybe; maybe not. (Gore has long complained about the undue influence of conservatives on talk radio and Fox News, so you <WSD>do the math</WSD>.) 
Meaning of the word marked with <WSD> tags:  To make a thoughtful effort to determine the motive for someone's behavior; to develop one's own understanding of the explanation for or precise nature of a situation.