I’ve been looking into Right Start Math which was designed by a Montessori teacher. It’s really fascinating and I love the concept of 5+. I’m planning to get the curriculum and use it in combination with Montessori. I’m making my own bead materials in the 5+ fashion (5 dark, however many light, in the Montessori colours). I’m thinking of making my number rods as suggested in this power point presentation. It’s fascinating, I recommend you take some time to click through it.