Kids can use flash cards to learn important concepts.  By working with the same flash cards multiple times, as kids practice, they will begin to learn with active recall.  Separate cards into piles of "I know" and "I don't know."  Kids can continue to practice with the cards they do not yet know and build confidence by reviewing the cards they do know.  Kids can learn by watching and listening to an adult say the word, phrase, or number and repeating what they hear.  Use lots of praise and patience with your child and be sure to keep the practice session with young children short.