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I keep my PC calculator opened when I am playing and type in the number of outs I have X 4 on the turn, X2 on the river.. if you can't add quickly in your head... having the calculator opened helps. [img]/images/graemlins/tongue.gif[/img]
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You could also print out a chart to be more accurate with that.
When I first started playing, I consulted the Wikipedia article with the starting hand rankings and used this chart:
http://home.houston.rr.com/texasholdempoker/odds.htm to help me make my decisions.
I haven't looked at those pages in months, but they were a good starting point. Once you start playing more, you'll not need to rely on them anymore.