I believe In Blackjack, common mathematical pitfalls include misunderstanding probabilities, which can lead to poor decisions based on short-term outcomes rather than statistical analysis. Players often neglect to adjust their strategies according to the number of decks in play, overlook the fallacy of "hot" or "cold" streaks, and fail to manage their bankroll effectively due to emotional reactions. Being aware of these mistakes can help improve players' strategies and enhance their chances of success.