I am one of those people good at mental math - enough that our founders turn to me in meetings - and I think it's useful. Instead of thinking of it as a skill,

I am one of those people good at mental math - enough that our founders turn to me in meetings - and I think it's useful. Instead of thinking of it as a skill, think of it as an exercise. There are hundreds if not thousands of things trying to distract, mollify, enrage, and lull us into a "don't think, just act" attitude... having mental fortitude to counteract or ignore those is important.