Memorizing math facts doesn't really have anything to do with math abilities.. just with memorization skills. My DS8 has a difficult time with short term memory, but has amazing long term memory recall... so, it's hard to get him to memorize things like math facts initially, but once he does memorize something, it's in there forever.

Math also require a lot of reading and writing skills, as well as organization... I'd look at the other areas to see which ones your kiddo needs some help with.

~amy