Key to Decimals begins with basic concepts and operations on decimals, allowing it be used for simple review, a non-threatening introduction, or as a supplement for struggling students. It covers real-world uses of decimals in pricing, sports, metrics, calculators and science. Written with secondary students in mind, their success-oriented, self-paced, self-guided approach builds confidence and independence. Book Four covers rounding off decimals, estimating, graphing averages, the metric system and scientific notation. 45 pages, paperback. Notes and answer key sold separately (stock # 33087).