We have been going through the Singapore Earlybird math after we zipped through Saxon K (I haven’t seen the Primary Math yet). Some of it overlaps, but it goes further than Saxon at the K level. I have mixed feelings – some days I love it, some days I am thinking “what??” Some of the activities mentioned seem to be geared toward classrooms and seem either hard to adapt to home, or unecessary. What I do like about it is the emphasis on mental math and my son likes the colorful pictures. It is easy enough for him while still challenging him to move forward. I think it is structured differently from the Primary Math – the Earlybird doesn’t have a home teachers guide like the Primary Math does (the “teachers guide” for EB is very expensive – there are instructions in the kids books). I will say though, I have been really impressed with what I’ve seen of Math Mammoth. I am probably going to use it next (and she says she uses some elements similar to Singapore, i.e. pictures). From what all I’ve read about both, Singapore is great, but Math Mammoth would be equally as comprehensive. I feel like the Math Mammoth allows for more customization for the homeschool student (and it’s a lot cheaper!). It is not so cumbersome and is a much more simple approach. Like I said in my earlier posts, Ruth Beechick and Maria Miller seem to have a lot of good information about math learning (if you want to do some reading on that). I want to make sure he understands the hows and whys and can think through it in his head and not just memorize a system or finish a book – also I want him to see how to use his math in everyday life. So, we are focusing on that and letting the books sort of give us some structure along the way. I’ve also found that my son enjoys and learns much better when we are just talking and working through problems rather than doing a scripted lesson (like Saxon – as much fun as we had with the K, we didn’t do it word for word like they script it). So, the less cumbersome the material the better for us. I’m very “mathy” so I apologize for the long post (I also am not good at being short and sweet – my sweet husband just smiles when it takes me 10 minutes to explain what he can in 2!).