Saxon Math answer guides can be purchased from publisher Houghton Mifflin Harcourt or from other vendors of the curriculum. Saxon Math is a popular curriculum that incorporates incremental learning, highlighting the ongoing use of principles once they have been introduced.
It is common for used texts to be resold, especially among home educators, and the lack of an answer key can be inconvenient. Some online sites provide access to Saxon answers with either free or paid registration. It is important to verify that editions match as problems and formats may be changed slightly in later releases. It may also be possible to find used answer books for sale through auction and second-hand book sites.