HOUGHTON MIFFLIN HARCOURT
wrote Math in Focus Course 1 Grd 6 (Math in Focus: Singapore Math)
comprising 200 pages back in 2011.
Textbook and eTextbook are published under ISBN 0547579039 and 9780547579030.
Since then Math in Focus Course 1 Grd 6 (Math in Focus: Singapore Math) textbook
was available to sell back to BooksRun online for the top buyback price
of $ 6.61 or rent at the marketplace.