The main advantage of using multiplication flashcards is the ability to quickly memorize multiplication facts. Multiplication is best learned through memorization, and flashcards are just one method teachers and parents can use to help students practice different number families, increase speed at which multiplication problems are solved and build fluency in multiplication facts.
There are many online flashcards and math specific apps for smartphones and tablets that have replaced the index card flashcards. Apps work well because students can take their flashcards anywhere and practice at anytime, and some apps even record a student's progress.
Another benefit of flashcards is that the card's design can change according to student needs. Instead of a problem on one side and an answer on the back, a teacher can put the numbers two, three and six on a card so students can cover up one number and solve the problem.