Some websites, such as Abe Books, sell used versions of McGraw Hill math answer keys. This website has grade 1 answer keys in good condition as of 2015; they were published in 2003. The book is sold by various sellers through Abe Books.
Used copies in good condition as well as new copies of the grade 5 answer book are available from Amazon. This book has 155 pages and was published in 2005. As with Abe Books, third-party sellers sell their copies of this book through Amazon.Learn more about Education