There are two types of Roulette tables, American and European.
In American Roulette there is a zero and a double zero on the table, making your single number straight up bet pay out 35-1.
In European Roulette there is only a single zero on the table, making your single number straight up bet pay out 36-1.
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In roulette, betting any number 'straight up' means that you are betting that a specific number will appear on the next spin of the wheel. Straight up roulette wagers pay 35-1.
Straight up bets are made by placing chips in the center of the number on the roulette table. I emphasize the center of the number because placing across the borders of numbers indicate other types of bets (splits, streets, corners).
Complete rules of roulette are here:
http://theonlinecasinogamblingdirectory.com/rules/roulette.php