Why do we round up 0.5000 to 1 instead of rounding down to 0?

Question

Why do we round up 0.5000 to 1 instead of rounding down to 0?

In: 12

Answer 1

5 isn’t the “middle” of 10, it’s half. 0-4 is half, and 5-9 is half.

5 is the first number on the second and higher half, which is why it makes sense to round up.

I do not have any post secondary or academia awards around math and could be completely wrong so feel free to ignore this but thank you anyways for coming out to my cold-soup-in-a-milkcarton swamp ditch Ted talk.