That is part of the hang-up for me right now. I feel like I need to use the Standards Edition (we're in California, we use a charter, she'll be doing math in a classroom the following year,...), but there is no HIG for the Standards 5A yet, so I'd have to buy the teacher's manual. I think if the HIG was available it would have made the whole decision easier for me! Maybe it's only a $$ issue. I suppose the Teacher's Manual will show how to work the problems, too. I just hate teacher's manuals! I much prefer materials written for homeschoolers.
Decisions decisions...