Which mathematics textbook series faced a massive recall in 2008 when it was discovered that approximately 18% of its numerical answers in the teacher's edition were incorrect?

Product recalls aren't just limited to consumer goods - educational materials have their fair share too! In the world of mathematics education, textbooks occasionally contain errors that range from minor typos to significant conceptual mistakes. One particular recall stands out as having forced publishers to completely rethink their quality control processes for mathematical content. Test your knowledge of this notable incident that impacted mathematics classrooms across the country.

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• Pearson's 'Integrated Mathematics'
• McGraw-Hill's 'Everyday Mathematics'
• Houghton Mifflin's 'Saxon Math'
• Cengage's 'Contemporary Mathematics'

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