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Math Mammoth Fractions & Decimals 3 continues the study of fraction and decimal topics, on the 6th grade level. The goal of the book is to go through all of the fraction and decimal arithmetic, using up to six decimal digits and larger denominators in fractions than what is commonly encountered in 4th and 5th grade materials. It starts out with the study of decimals, the metric system, and using decimals in measuring units. Scientific notation is a new topic.