I am one of those people good at mental math - enough that our founders turn to me in meetings - and I think it&#x27;s useful.<p>Instead of thinking of it as a skill, think of it as an exercise.<p>There are hundreds if not thousands of things trying to distract, mollify, enrage, and lull us into a &quot;don&#x27;t think, just act&quot; attitude... having mental fortitude to counteract or ignore those is important.