I hope everyone is having a nice summer. Ours is flying by, and I can't seem to find time to write all of the posts I have floating around in my head. In the meantime, I just had to make sure everyone saw this.
Jonathan Feagle at Cultivating Dharma made his elementary math album available for download (for free!) online. It's called Math Album, First Part, so I don't know if that means there's more to come, but this is years worth of material to work with.