Learn to count backwards to help with the minus counts in blackjack. This is a good exercise to practice at home or while watching the big six wheel. Start at 20 and count down to zero. Next count down from 20, but this time do it by 2s; 20, 18,16,14, etc. Then count down by 2s with odd numbers; 19, 17, 15, etc. Do these drills a couple of times a day to help with memorization. It should also cause an automatic reflex action in the subconscious mind that will help at the blackjack table.