After I moved on to other employment the math educators changed the way, even the math vocabulary, every few years. I doubt seriously that I could teach math in today's schools.
That method has worked well for 100's of years. Why anyone would change how math is taught is beyond me. Teaching New Math really pissed me off, "set theory" to grade schoolers? Really? Fools. Just pound arithmetic into their little mushy heads first. Once they can do long division competently then we can move past arithmetic. Not before.