We all have been there... asking how to divide paper into 14ths or 15ths and occasionally got the answer of "just make 16 grid and cut it". Another scenario is being terrified with prime number division like 13ths or 17ths. In reality it's not that difficult. This post will share how to make such division just inside your head so you can start folding right away. I promise it won't require any arcane maths.