[stylos]

Assuming that you mean place bets, the true odds are:
4&10 2:1
5&9 3:2
6&8 6:5

However, place bets have lesser payouts so the payout odds are:
4&10 9:5
5&9 7:5
6&8 7:6

Therefore, if you are putting a place bet on 4, 10, 5, or 9, multiples are 5 are favorable, and with 6 or 8, multiples are 6 are favorable.

ie:
Place bet $5 on 4 or 10, the payout would be $9.
Place bet $5 on 5 or 9, the payout would be $7.
Place bet $6 on 6 or 8, the payout would be $7.

In terms of what happens if you hit, you can tell the dealer what you want to happen with your winnings and/or bet. For example, some common moves would be: take everything down (bet/winnings), raise your current place bet X units, or shift your place bet to another number. Some dealers will pick up on betting patterns and make an action automatically and just confirm it with you. Bottom line is just tell them what you want, you don't need fancy terminology [img]/images/graemlins/smile.gif[/img], especially in a touristy place like Vegas.