This is extremely interesting to read. I did learn my multiplication tables correctly, but I was always horrible at mental arithmetic—my elementary school peri

This is extremely interesting to read. I did learn my multiplication tables correctly, but I was always horrible at mental arithmetic—my elementary school periodically had formal exams for mental arithmetic, and I consistently failed them. It was the only type of task where I ever consistently scored less than 90%, I am also terrible at directions, my parents used to be worried about what would happen to me when I lived on my own—thankfully, Google maps became a thing and nobody notices I am bad at directions anymore. Like you, my learning difficulties are strictly compartmentalized to these two specific domains. I hold a PhD in engineering, and I even have a minor in math, lol.