I wanted to pass along a great tutorial I found awhile ago. It's about math.
It's about how to know how to evenly pick up stitches for sleeves, or a button band, or a collar or whatever you need to pick up stitches for, by just doing some simple fractions. This is a tutorial I've used in the past and when I went to try and find it today -*nothing*-. I was searching for the link forever and I finally found it in my Facebook Saved Links (which is weird, because I almost never use those!)
(It's also been added to our Tips page!)