It takes soMe switching of thought but my boys caught on fairly well and are good at breaking things apart to quickly do problems based on 10s. With that said some of the explain how gets tedious. Since we're at home I just have them verbally explain it to me as if I didn't know how.I'm sure it's a great tool.
I learned math between 1970 and 1984.
Learning a new system of learning is hard.
I don't think in the manner which this curriculum wants me to.