I'll be the first to admit I'm terrible at math. So that was a big concern when I brought 14yo dd home. I decided to give her a break from math until I could figure it out. Workbooks were a bust. They had answer keys but didn't explain how to do it. Crap! Finally I stumbled upon WOWmath.org. Yea! This guy (he's a teacher) made videos teaching Algebra 1 Algebra 2 and AP Calculus. He even put up online practice tests with answer key. So now, dd and I watch the videos together and learn together.
I'm 30 years old and I finally learned how to add, subtract and multiply integers, LOL!