Mastering Powers of 10: 5.NBT.2
I've never had success just teaching students the algorithm (move the decimal over...do the decimal dance) without helping them "see" what's actually going on. As usual, I learned so much content myself! I added a couple of charts that help students see the "power of powers" and it seems to make a difference with my kids.
Check out my newest product on Teachers Pay Teachers http://www.teacherspayteachers.com/Product/Mastering-Powers-of-10-Content-and-Practice-5NBT2-865079
Let me know what you think!