We use MM, Fred, Beast Academy, Khan, math picture books, the Number Devil, Number Stories of Long Ago, Mathemagic, and Mathematicians are People, Too I and II. We play games that use math skills, and we use some of the rhymes and hands-on math projects found in Waldorf curricula. Mostly, math is anything but boring here because dd draws inspiration from learning about the great mathematicians throughout history. She sees mathematical connections in the world around her. Math is a living thing to her - not an isolated subject. I paid a lot of attention to the Living Math site when I first started homeschooling, and the info I picked up from there helped shape what we do.