Help supplement your student's middle school math curriculum with Steck-Vaughn's Middle School Collection: Pre-Algebra, Data Analysis & Probability. Providing additional practice opportunities, worksheets cover order of operations, addition & subtraction, inequalities, arithmetic sequences, experimental probability, permutations, combinations, finding the medican, independent and dependent events, and more. 112 classroom-reproducible pages, softcover. Answer key included. Grades 8.