I am wondering if anyone here has used Sadlier-Oxford Pre-Algebra program and Dimensions 7/8 (Singapore) Math and could give me some input on those programs.

Hi everyone, I'm finally trying to take the plunge into classical methods in earnest, but we've used Khan Academy as our math spine for years now, along with Math Mammoth (just couldn't slog through it for some reason even though it's really thorough and good) and intermittent use of old Houghton-Mifflin Mathematics school texts. DD12 is roughly 2/3 of the way through Khan Academy's Pre-algebra mission, but when I gave her a few tests recently, I saw to my dismay that she didn't apparently understand fractions, decimals, and percents deeply enough not to get caught or bewildered when given problems "off the hip" that didn't follow her familiar format. Though I expected the Fractions book to be too easy, she stumbled on the Bridge Activities, and now I am considering having her go through it, as well as the Life of Fred Decimals book, before letting her move on, either to Life of Fred Pre-algebra, or else something else. We'll keep the Khan (it has been useful for years, and helps me keep track of progress) but I am now looking at Life of Fred for my younger ones, too. My question is, has anyone else found LoF to be good for remediating conceptual lack? And what do you use for procedural mastery, alongside it? Everywhere I look for reviews on LoF, I see almost nothing but glowing testimonials, but what I want to know is, is it rigorous enough on its own? It doesn't include repetition or "practice" so what do those who need more than a bit of conceptual "aha" moment, do for that? Does anyone have success or failure stories to share, with their use of LoF? Has anyone else transitioned into it after using other things, and how did that go? What has it been like for those who started off with Fred? Thanks for any help.