I am sure you are as well-versed about “number sense” as I am. Recently though, I have run across the idea of “Number Talks” from several different sources. One of them was a mention made by Ruth Anna Kuhns about the books Number Talks… (there are several in the series) by Sherry Parrish. There was video series mentioned in a newletter feed from TeachersPayTeachers earlier this year. While I haven’t delved very far into these resources they may be a good jumping off place. If you find any other good resources, please share.