Better than traditional flash cards, number-bond cards take students beyond just practicing math facts. They illustrate the relationships between numbers as well as the inverse relationship between multiplication and division. Students work with these flash cards to build fluency, and gain number sense at the same time. Teachers can use the cards with the whole group, with small groups, in pairs, or with individuals, Answers are included on the back of every card, so it's easy for students to check their own or each other's work. It's easy to differentiate, too. 82 cards.