I am not a mathematician and I do not do long division on any regular basis. I certainly haven't written it out in over a year.
But occasionally I have to think about whether a number like 365 is divisible by a number like 7, and I don't have a calculator or computer beside me. I can wait until I'm around electronics, or I can think:
"How many times does 7 go into 36? 5 times."
"That makes 35, so now, there's 15 left."
"How many times does 7 go into 15? 2 times."
"That makes 14, so I'm at 364 -- one day is left over."
"7 went into 365 52 times, with one left over."
That is a useful algorithm. You can use that to answer questions about the world. It seems reasonable that if you're not capable of accomplishing that, then you're not going to do well in an environment that requires you to solve problems.
Or to answer that one you can just think "Hey, can I reuse the same calendar two years in a row?" and if the answer is no, then 365 isn't divisible by 7.
But occasionally I have to think about whether a number like 365 is divisible by a number like 7, and I don't have a calculator or computer beside me. I can wait until I'm around electronics, or I can think:
"How many times does 7 go into 36? 5 times." "That makes 35, so now, there's 15 left." "How many times does 7 go into 15? 2 times." "That makes 14, so I'm at 364 -- one day is left over." "7 went into 365 52 times, with one left over."
That is a useful algorithm. You can use that to answer questions about the world. It seems reasonable that if you're not capable of accomplishing that, then you're not going to do well in an environment that requires you to solve problems.