"Managers, salespeople, and lawyers with [a] poor understanding of math as basic as adding fractions are very risky. It's not that they can't perform most job functions, it's that they are extremely likely to make costly mistakes. 'When should I add one more person to keep people from charging as much overtime?' Or, the old: 'Should I offer overtime or comp time?' etc. As [for] salespeople and lawyers, effective negotiation require[s] them to be able to say: 'I can't drop the price any more but I can do X' (which costs us less), etc.
"Graphic[...] designers often use a lot of math directly when working out layouts and things. An intuitive understanding and lots of effort can help compensate, but it's a significant loss if they can't do simple math on how tall / wide things are when you scale them."
Is that written poorly enough to take the time to passive-aggressively call someone stupid on the internet?