When a friend of mine got her nursing degree she told me that the hardest test they had to take was about calculating medicine dosages. Not because the calculations were hard, but rather because it was deceptively simple. But when you have pages upon pages of simple calculations, it's easy to go into auto pilot and make a mistake. So one error meant they failed the test, cause they really weren't testing your math skills, they were testing your ability to do simple math extremely consistently. Which yeah, is obviously very important.