I have found introducing double digit multiplication using partial products is a very effective tool. I would then show my students the traditional way that most parents know. I am always searching for ways to reach different students skills that they need, one way to explain a topic doesn't work for everyone. The problem I have with Singapore math is that it is all drill. There are no hands-on models and they introduce topics before students are ready for them. Some drill is okay but most students are turned off when that is all they do.