Helps kids to develop an understanding of patterns and number relationships utilizing a number grid from one to one hundred and twenty. ?One hundred and twenty clear pockets make this chart ideal for teaching numbers, odds, evens, and operations. Different color on reverse side of number tiles to highlight patterns. Chart is washable and made of nylon. Pockets are clear for easy viewing of numbers. 120 numbered cards are printed double-sided to demonstrate number patterns. Built in metal grommets for easy hanging and prevention of wear and tear to nylon material. 27" x 31.89". Recommended age 5-10 years