Multiplying by 10, 100, & 1000 - strategy explained.

This is a great slide show and really explains the multiplication concept very well. Please don't just tell me to add zero's... I'll need more explanation than this. 

Maybe if you feel like an expert you might want to produce your own 'Explain Everything' and blog it. Remember you'll need top quality learning to show at parent-teacher interviews. This could be something to show.