The only way I've become at all proficient in arithmetic is from teaching calculus for over a decade. I messed up a simple addition fact in a lecture (the sum of two numbers less than 20) just this past week.
We have a saying in my country: 'running into a dick forest with an open mouth'.
Madness string 93505
When you think about it, Macho Juggernaut is really on everyone's side.