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Multiplying and dividing large numbers. Simplifying fractions and converting percentages. Handling square roots and exponents. These and other skills are the veritable foundation on which all of mathematics rests. To master them is to unlock the door to more advanced areas of study-such as algebra, geometry, and calculus-and to discover new levels of confidence in dealing with the math of everyday life. Whether you're a high-school student preparing for the challenges of higher math classes, an adult who needs a refresher in math to prepare for a new career, or someone who just wants to keep his or her mind active and sharp, there's no denying that a solid grasp of arithmetic and prealgebra is essential in today's world. Knowing the fundamentals of mathematics can increase your chances of success in high-school and college math classes; prepare you for a career in a field that requires a strong foundation in math, such as economics, engineering, medicine, and the building trades; strengthen your everyday critical thinking skills; and help you handle with confidence everyday tasks such as shopping and planning a personal budget.