Trimming a 5" pieced square to 4" accurately

[jingleme]

Hi & welcome to this forum!

I like Deni's approach too. But....I'm a chicken.....I would do each one individually. I usually fold in half twice & finger press cross hairs onto each block first to find the center & then use the fold lines to line up my ruler at 2". Then cut 2 sides, spin, & cut the other 2 sides. I do this so often, that I bought one of those rotating mats that Jenny uses. I love that!
good luck with your project. would love to see pics.......