We've been using Saxon since my 6 y/o started school, but he just finished Saxon 3 and I'm concerned that he may not be able to "hang" with the later Saxon books, what with all the format changes and lesson lengths. I use Nicole the Math Lady for my older kids, and we already do half of the mixed review problems, and I still don't think it's a good fit for my ADHD-er. He gets math concepts fairly easily, so I've been looking into books that will let him set the pace and won't bore him with too much repetition. However, I've never used Learn Math Fast, so I'm starting from scratch here. Any advice is deeply appreciated!

tl;dr: is Life of Fred math enough on its own for ~4th grade and ~2nd grade alternative learners? Saxon worked great for my oldest—still does. Then along came my daughter (9.5), who was diagnosed with dysphonetic dyslexia toward the end of 2019, and my son (7.5), who was recently diagnosed with ADHD. Math for both of them has been a struggle with Saxon. I've been researching for DAYS, and I really love the idea of Life of Fred for them. I feel like it will take the pressure off of math, and my daughter has shown great growth with story-type learning (Pet Math, Times Tales). However, I'm used to the solid progress I see my oldest get with Saxon. I'm trying not to compare kids, but it's really important to me that my kids end their high school years with a solid understanding of math. Is Life of Fred enough on its own?

I am in no way suggesting that trouble with vowels = dyslexia, but I will say that "not hearing vowels" or being able to sound them out was a symptom of my daughter's dysphonetic dyslexia. However, we did not consider it to be an issue to pursue until she was about 8.5. It's worth doing a quick search to read a little about it, though!