I computed my multiplication tables this exact same way as the great-grandparent during grade and high school. I memorized the tables, but I had this same probl

I computed my multiplication tables this exact same way as the great-grandparent during grade and high school. I memorized the tables, but I had this same problem of having to sequentially run through them to compute anything. Eventually in college taking tons of math courses finally ingrained it in my head, but to this day I feel like I must have missed something when everyone else was doing their multiplication tables.