This reply was originally posted by user whizinc in ADDitude’s now-retired community.
I was a staff assistant with a very bright young man who also didn’t know his multiplication tables as a freshman in high school. He was in an algebra/trig class. I was there for behavior help rather than academic. My question to you is does your son understand what it means to multiply? If he understands the concepts well, you may decide that this is not a battle you want to fight, and get the accommodation of being able to use a calculator in every math class.