Spongebob Squarepants Flash Cards (Addition, Subtraction, Money) (2 Sets) Learn addition, subtraction and money with Spongebob and friends! Two sets of flash cards; Addition and Subtraction, and Making Cents. Large cards measure 3 x 5 inches. These SpongeBob learning flash cards are designed to help develop and reinforce basic math and problem solving skills. Filled with full color images of Spongebob and his friends, these learning cards are sure to be a SPLASH!!!