Help students strengthen their understanding of inverse operations with these flashcards! Featuring three numbers of an addition/subtraction fact family and a unique triangle design, these cards make it simple to practice math operations. Simply cover one number at a time, and use the other two numbers in an addition or subtraction expression. Use in math centers, during tutoring, or individually in class as a quiet activity. Each pack includes 46 double-sided flash cards. Cards measure about 5-1/8" per side.