Origami Basics Tutorial: Folding a 15-division square grid (15×15)

This video shows you how to divide a square into 15 equal parts, for example to fold a 15-division square grid. I begin with finding 1/3 using Haga's method. for more details about Kazuo Haga's method: ⇒ https://en.wikipedia.org/wiki/Mathematics_of_paper_folding#Haga's_theorems ⇒ https://books.google.co.uk/books?id=zJR2Rr_wuFQC for more details about the other method: ⇒ https://haditahir.wordpress.com/2015/05/12/membagi-persegi-menjadi-n-bagian-how-to-divide-a-square-into-nth/