Does anyone have any cool math riddles?

[QuickStop]

my math teacher gave this to us a few weeks ago. it's pretty easy

EDIT: 3 CANNOT BE NEXT TO 2 or 4 (not 4 or 5 like i wrote)
(screen.width/2)){this.width = (this.width/2)}" onclick="javascript:if(this.width > (screen.width/2)){this.width = (this.width/2)} else {this.width = (this.width*2)}" border="0" alt='Posted image: Click to resize'>

Disregard the example..i fucked it up



Edited By QuickStop on 1079039037