Write & Wipe Fact Family Boards. 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. Measure 10"H. Grades 1+ Details:Multicolored10"Format reinforces fact families and number fact fluencySupport algebraic skills such as equations, the commutative property and problem solvingFor ages 5 and up