How do you analyze deals quick

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I was wondering how do you analyze the numbers on apartment deals very quickly. I'm not talking about going through a full blown due diligence check, but just a quick check of the numbers presented to you (hoping they're not proforma but actual P&L numbers) to even see if you want to go any farther.

I know about different analysis spreadsheets which i think they're great. but what i'm talking about is how do you analyze the numbers/deal if you were out in the field and all you had was a calculator.

what i want to know is:
1. what info (numbers) am i required to get to do this quick analysis
2. how do i properly use these numbers to make them mean something (like is the deal over or under priced, will it be hard or easy to get funding and etc), so what's the equation.