Not sure if this is really the right place to post but as it's to do with supporting DC at secondary school...
For all that I have two degrees, I had quite a fragmented early education which leaves me with gaping holes/knowledge deficits in some subjects (Sciences and Maths most noticeably). For example, I never learned to do equations (as I moved from a school where we'd not even started learning them to one where they'd already been taught them - I was in Year 10 when I moved). I got a C in Maths but I count myself as being lucky to have passed first time around TBQH (it was a fluke!).
I am fine with day-to-day Maths and managed to complete a post-grad course which included statistical analysis so I don't think I'm beyond help.
DC1 reached beyond my knowledge in Year 7 but we were never able to give him the support he needed later on to GCSE 'Higher' level - he got a 6 (but really should have done much better). DC2 hates Maths (although not bad at it from what I can tell) BUT I am almost reaching the end of the line with the help I can offer to support her. Yesterday evening I had to spend half an hour revising how to work out volumes/surface areas of things like trapeziums (I'm okay with the basic shapes like cuboids) before trying to explain it to her. It was starting to pickle my brain (until I found Dr Khan's Academy which I did find useful).
Bottom line is that I'd like to be able to improve my own Maths to support DC2. I don't have a 'can't do' attitude and as an adult I can understand some principles that I didn't get as a child/teenager. So how could I expand my Maths ability (to fill in the gaps) without having to do a course which takes me back to the extreme basics (which I can already do)? Any suggestions?