I made a comic (well, three of them)
When I taught basic math in ABE, students were lost when it came to the times tables. They all remembered struggling with flashcards and timed tests. They remembered feeling frustrated. They remembered parents and teachers urging them to “try harder” when they were trying as hard as they could.
I saw how the times tables had been a stumbling block to all the math classes that followed. When you cannot recall the times tables, it is very difficult to understand and work with fractions and per cents, which come next. I saw how the teasing, and the feelings of failure or not being smart enough had taken all the joy out of math learning, and followed them into their adult lives.