Use your ten flashcards for another game, this time involving two people.  Simply take turns quizzing each other on both the number and the text of each Commandment.  Have one players show the numbered side of a flashcard, and the other player recite the text.  Reinforce what they know by then showing the text side and have the player tell the number.  Go through the set by handing each correctly answered card to the player until he or she gets all ten of them.