The New Math was long before my time... Or to be more specific, it was already being taught in schools when I was growing up.
But maybe it could be altered for common core...
I turn 73 next month, so I’m Old Math. My first masters degree was in education and I was horrified by the woman teaching new teachers to teach math. She assumed they were idiots and made no exceptions. Everything was rote and we were not allowed to question anything she said. I wanted the degree so that I could homeschool if I ever had children. Can’t imagine the terror of entrusting a child to someone else.