Okay, thanks for the help. I had worried that beast academy was only one grade so far...the grade he is working through though. But yes, it could be a prob when he finishes it. And LoF looks fun, but if you would not use it for the whole bang, then Singapore it is! Although I might just try LoF fractions for fun.
Thanks. Of course, we might always change down the road...but that's the beauty of this thing!