[Steve00007]

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Try and count bets, rather than the amount of actual $$$ in the pot. After the pre-flop betting is complete, you can multiply the number of players times the number of bets each put in. Do the same thing on the flop, then cut that in half going into 4th and 5th street.

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Sometimes the dealer will make things easier by saying something like "5 players" after the preflop betting is complete. This doesn't always happen though, so I wouldn't rely on it too much.