Just today I learned that just because someone compiled it, made it into an information sheet, made copies and handed them out at a meeting doesn't mean that the information is accurate on said sheet!
I used a handout on how to make 8 HSTs at a time and it gave the sizes of squares to start with to make finished HSTs of certain sizes.
Can you guess that the sizes of starting squares given were not accurate and that I made 3, yes 3 sets before I cut them and pressed them open to measure them? Luckily I had enough fabric for do overs!