Originally Posted by aeh
Singapore Math . . . For the first level I used, I bought the textbook, and have not done so since. We use only the workbook.

Just to add another data point, I was cursing myself for having just ordered textbook + workbook when I read this. And at first it seemed true for us to. But now we've switched to using just the textbook and not the workbook, and that's working for us too. The textbook seems to be largely redundant with the workbook, but with a few worked examples in a kind of show-and-tell style, and then only a few problems for the student to work. I'm finding this quite useful to buzz through a lot of material quickly and see what she gets and what she doesn't. The stuff that she doesn't, it's easy enough to make up a few more problems on the fly for her to do. Plus, the textbook is in color and looks and feels more fun. So this is working for us so far. May change when we get past material that she already partially grasps.