Dora the Explorer ABCs & 123s Learning Flash Cards (Alphabet & Numbers) Have fun learning with Dora the Explorer and her friends! Two colorful sets of flash cards: numbers and alphabet. Each set has 36 cards. Extra large cards measure 3 x 5 inches. These learning cards are designed to build and reinforce letter and number identification through various educational activities. Take your child on a learning adventure with Dora the Explorer!