Learning Resources Write & Wipe Fact Family Boards, Set Of 5 Boards, Ages 6+, Multicolor, 10 H In (Ler3799)Familiar triangle format reinforces fact families and number fact fluency. Double sided, write & wipe boards focus on addition subtraction on one side, multiplication division on reverse. Support algebraic skills such as equations, the commutative property, and problem solving. The Learning Resources Write & Wipe Fact Family Boards Set of 5 Features: 5 Double sided Triangle Boards Write & Wipe Surfaces Size of 10''H each