Holt, Rinehart, and Winston (HRW) is a publisher of textbooks and curriculum materials for high school mathematics education. The company was founded in the early 20th century and was known for its innovative teaching materials that helped students understand math concepts better. They are known for producing high-quality and engaging textbooks, workbooks, and teacher guides, as well as other ancillary materials like online resources, assessments and software. They have a wide range of math textbooks that cover the main topics taught in high schools such as Algebra, Geometry, Trigonometry and Calculus. Holt, Rinehart, and Winston was acquired by Houghton Mifflin Harcourt in 2007, but the brand is still used today.
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