Tips for an adult to learn math -- from the beginning.
Check out the following four playlist in order. These are made for people who don’t know how to add or subtract and it even explains the decimal number system.
http://www.youtube.com/playlist?list=PL301908982CBFE20D&feature=plcp http://www.youtube.com/playlist?list=PL50D1D09ABE9CE271&feature=plcp http://www.youtube.com/playlist?list=PL1C68557896CFABA8&feature=plcp http://www.youtube.com/playlist?list=PLE23E2FDF6E935778&feature=plcp
I hope this helped. It helped me to learn other stuff. Of course you can start from a more advanced playlist if you feel you already know one of them.
Thinking Blocks is a great resource for understanding ratios and proportions.(And it also has addition and subtraction. It's very interactive. It guides you one step at a time, and gives you feedback every step, so you know if your thinking is correct. You don't have to wait until the end of the problem to find out.