I'm loving Heidi Samuelson's idea @ Swamp Frog First Graders of a doubles ipod. I've uploaded a template for one that I printed on #10 business envelopes. The students will store their doubles flashcards in the bottom part of the envelope ipod. Searching for a catchy doubles song I found "Addition Rock" by Alabama Axeman on YouTube. We'll try it out tomorrow and upload a few decorated ipods.