The AEI analysis warns that these numbers change from year to year, but it concludes that by eliminating these two deductions and a few other smaller ones, Mr. Romney can make his math add up.

WSJ: Review & Outlook: Mathematically Possible

Lower Taxes, Fewer Deductions: Are Romney and Ryan Dodging the Specifics? and Fact-checking Romney-Ryan: Does the math add up? and A Progressive Tax Code is Economically Destructive Lowering, not raise, the top marginal rate is the right direction.

FORBES: No, I'm not voting for Obama

Does the math add up?

FORBES: Lower Taxes, Fewer Deductions: Are Romney and Ryan Dodging the Specifics?

But the math has to add up.

WHITEHOUSE: The White House

Despite the faith in the freemium business model of a lot of my colleagues in Silicon Valley, the math does not add up, and that is why I ultimately decided not to embrace the freemium business model when I founded my company four years ago.

FORBES: Why Freemium Isn't Free

The numbers need to add up, the math needs to work and the team cannot continue to be mum on the details.

FORBES: What The VP Debate Taught Us About Romney/Ryan - and Didn't Tell Us About Tax