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Almost everyone needs some math in everyday life, at work, in a career, for study, for shopping, for paying bills. dealing with a bank, in sports, using credit cards, etc. This series of books simplifies the learning, understanding, and use of math, making it non-threatening, interesting, and even fun. The series develops math skills in an easy-to-follow sequence ranging from basic arithmetic to pre-algebra and beyond. These books draw on material developed by the U.S. Government for the education of government personnel with limited math and technical backgrounds. Volume IX covers integration formulas, combinations and permutations, and probability.