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Math Mammoth The Four Operations (with a Touch of Algebra) is a mathematics worktext meant primarily for fifth and sixth grades. Some of the lessons can also be used in seventh grade. The lessons include both the explanations of the concepts, as well as practice exercises. The lessons are taken from the Math Mammoth complete curriculum for fifth and sixth grades. so they may not always flow smoothly from one lesson to the next with a perfect continuity. There is some overlap between them, and you can choose to omit some exercises. The main topics studied in this book are simple equations, expressions that involve a variable, the order of operations, long multiplication, long division, and graphing simple linear functions.