Thanks urrmomo YOU have been a great help! I understand Millimeters way easier than inches. I can visualize 13mm; it's just 1 centimeter plus 3 millimeter. I can't visualize 36/64... YIKES! 36/64? isn't that improper because both numbers can be divided by 2?

EDIT:: I messed up my post earlier... urumomo said 35/64 and I messed up and said 36/64.  I looked at previous posts and saw my error.