RightStart Math's Trifold - great for any setting. The Trifold reference guide includes the Basic Number Chart, Fraction Chart, and the Multiplication Charter, along with great reference items for your student. These reference items include information on basic formulas, terms and strategies. Size is 24.5 x 11.5 inches each, and come folded into a trifold for easy storage or placing on your student's study area or desk.
The tri-fold has been an excellent visual for both my kids, in levels C & E.