The Singapore Math® Live support is based on Primary Mathematics Textbooks A and B (US Edition), Workbooks A and B (US Edition), Intensive Practice A and B (US Edition), and the Challenging Word Problems book (CC Edition.) Click here to see the ISBN for each book and each level. With Singapore Math® Live support, most parents that I have heard from do not feel like they need the Home Instructor’s Guide, but of course that is a personal choice.