Sometimes you just get outliers. For example, there were some methods taught to my kids in elementary school as part of an emerging common core math curriculum

Sometimes you just get outliers. For example, there were some methods taught to my kids in elementary school as part of an emerging common core math curriculum that I disagreed with quite a bit. I didn't take it to the school though because they were stuck in the middle of a state mandate and pissed off parents. I just helped my kids differentiate some of the more fundamental methods from helps/shortcuts (like sections on estimation).