At the Illuminations Summer Institute, we just had a great presentation about Singapore math models by Susan Midlarsky (www.susanmidlarsky.com). Those of you near Verplanck, NY, should check out one of her presentations if you get a chance!
Susan showed us the general method, and then she showed us some online tools. Check out www.thinkingblocks.com. It gives an online tool for generating the models used in Singapore Math to solve problems.