Carson Dellosa's Subtraction Flash Cards present an easy fun way kids to practice essential math skills. This set includes 54 self-checking flash cards that feature more than 100 subtraction problems. Large, bold numbers are placed on a white background for easy reading, a special bonus card offers creative game ideas that are designed to help reinforce learning. Flash cards allow kids to develop critical thinking, decision-making, turn-taking, other skills while allowing them to learn a fun, hands-on way.