I was taught this, I was not taught common core. Multiplication can boil down to addition and a n×10 times table. I realized I could break it down further to a n×5 table with n×10, because of what I learned with factoring.

I was under the impression that common core forced students into lengthy drawings for counting, encouraging close but not exact answers, and doing away with times tables entirely. There's probably more, but this alone is terrible.

Edit; I misunderstood, you're saying they changed the multiplication process entirely. That's pretty bad too.

I was taught this, I was not taught common core. Multiplication can boil down to addition and a n×10 times table. I realized I could break it down further to a n×5 table with n×10, because of what I learned with factoring.

I was under the impression that common core forced students into lengthy drawings for counting, encouraging close but not exact answers, and doing away with times tables entirely. There's probably more, but this alone is terrible.