This is one of the finest examples of the application of inverse morality to Common Core available online. You do NOT have to be a genius to figure this out. Just be willing to perceive a problem with the irrationality of the math and understand that magnified over a couple hundred repetitions, less than a school year, your child’s mind will be permanently programmed schizophreniform.
Common Core curriculum malingering overwhelms the imagination w/the double bind inducing a schizophreniform state of mind promising only to permanently damage child’s ability to think. There’s no question of what this is doing to young people psychologically. The question is how much longer are American parents going to allow this before someone snaps? My Advice, don’t snap, but DO recall district BOE/supers that promote this macabre.
Also, teachers are in the game, the point being that with not one of them fighting this you are squarely at odds with an institution that has no intention of backing down.