Thank you, Rosine. My informal questioning and observing shows that he is thinking mathematically...but the issue that you raised of developmental readiness was interesting to me. (I wish I had gotten my degree in Child Development instead of Accounting!!) I think that may be a key for him at this point. We are slowing down, playing math games, and doing just a bit at a time. Do you know of other resources that would give me some insight into development especially as it relates to learning math? Thanks!!

I appreciate this discussion, as I have a 7yo girl who sounds exactly like your son! She gets distracted so easily, and mental math has proven to be a big stumbling block. I'm glad to hear that we can keep using the abacus- that just may save her! Thanks,
Heather