Daily study of multiplication charts and flashcards is a great way to memorize multiplication facts. Other methods of memorization include using multiplication songs, timing yourself taking practice tests, and recruiting a friend that you can practice reciting multiplication facts to. Learning the commutative property can also be a huge help; once you know that 5 times 9 is the same as 9 times 5, the amount of memorization that needs to be done is immediately cut in half!