Matt_Parker_2 | Naive fraction sum proof @mattparker2 | Uploaded 6 years ago | Updated 7 hours ago
We know that a/b + c/d ≠ (a+c)/(b+d) despite generations of students trying that when they first have to add fractions.

But what does this ‘naive fraction sum’ actually represent?

It is always a new fraction between a/b and c/d.

This is that proof.