Why Are Rulers Punctuated with Holes?
We rolled our eyes at this one because the explanation is so obvious. The hole on the ruler’s beginning end is for hanging it up. Math teachers don’t need to search for strange baskets to organize these measuring instruments; all they need is a handy dandy nail in the wall to hang them all up! They can be put into 3-ring binders as well.
If only math was as easy as putting away the tools. But, since beggars can’t be choosers, we’re left shaking our heads, wondering why we didn’t realize what those holes were used for when we were kids.